Rösler, Margit, and Michael Voit. “Positive Intertwiners for Bessel Functions of Type B.”https://doi.org/10.1090/proc/15312__Proceedings of the American Mathematical Society 149, no. 3 (2021): 1151–63.https://doi.org/10.1090/proc/15312 .
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DOI: 10.1090/proc/15312

Tao, Youshan, and Michael Winkler. “A Fully Cross-Diffusive Two-Component Evolution System: Existence and Qualitative Analysis via Entropy-Consistent Thin-Film-Type Approximation.” Journal of Functional Analysis 281 (2021).
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Tao, Youshan, and Michael Winkler. “The Dampening Role of Large Repulsive Convection in a Chemotaxis System Modeling Tumor Angiogenesis.” Nonlinear Analysis, Theory, Methods and Applications 208 (2021).
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Wang, Yulan, Michael Winkler, and Zhaoyin Xiang. “Immediate Regularization of Measure-Type Population Densities in a Two-Dimensional Chemotaxis System with Signal Consumption.” Science China Mathematics 64 (2021): 725–46.
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Ding, Mengyao, and Michael Winkler. “Small-Density Solutiions in Keller-Segel Systems Involving Rapidly Decaying Diffusivities.” Nonlinear Differential Equatiions and Applicatiions 28 (2021).
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Tao, Youshan, and Michael Winkler. “Global Smooth Solutions in a Two-Dimensional Cross-Diffusion System Modeling Propagation of Urban Crime.” Communications in Mathematical Sciences 19 (2021): 829–49.
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Tao, Youshan, and Michael Winkler. “Taxis-Driven Formation of Singular Hotspots in a May-Nowak Type Model for Virus Infection.” SIAM Journal on Mathematical Analysis 53 (2021): 1411–33.
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Wang, Yulan, Michael Winkler, and Zhaoyin Xiang. “Local Energy Estimates and Global Solvability in a  Threee-Dimensional Chemotaxis-Fluid System with Prescribed Signal on the Boundary.” Communications in Partial Differential Equations 46 (2021): 1058–91.
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Wang, Yulan, Michael Winkler, and Zhaoyin Xiang. “Global Solvability in a Threee-Dimensional Keller-Segel.Stokes System Involving Arbitrary Superlinear Logistic Degradation.” Advances in Nonlinear Analysis 10 (2021): 707–31.
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Tao, Youshan, and Michael Winkler. “Critical Mass for Infinite-Time Blow-up in a Haptotaxis System with Nonlinear Zero-Order Interaction.” Discrete and Continuous Dynamical Systems 41, no. A (2021): 439–54.
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Klüners, Jürgen, and Toru Komatsu. “Imaginary Multiquadratic Number Fields with Class Group of Exponent $ and $.”https://doi.org/10.1090/mcom/3609__Mathematics of Computation 90, no. 329 (2021): 1483–97.https://doi.org/10.1090/mcom/3609 .
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arXiv: 2004.03308v2

Kirschmer, Markus, Fabien Narbonne, Christophe Ritzenthaler, and Damien Robert. “Spanning the Isogeny Class of a Power of an Elliptic Curve.”https://doi.org/10.1090/mcom/3672__Mathematics of Computation 91, no. 333 (2021): 401–49.https://doi.org/10.1090/mcom/3672 .
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Burban, Igor, and R. Abedin. “Algebraic Geometry of Lie Bialgebras Defined by Solutions of the Classical Yang-Baxter Equation.”https://doi.org/10.1007/s00220-021-04188-7__Communications in Mathematical Physics 387, no. 2 (2021): 1051–1109.https://doi.org/10.1007/s00220-021-04188-7 .
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Bruns, Julia, Hedwig Gasteiger, and Carolin Strahl. “Conceptualising and Measuring Domain-Specific Content Knowledge of Early Childhood Educators: A Systematic Review.”https://doi.org/10.1002/rev3.3255__Review of Education 9, no. 2 (2021): 500–538.https://doi.org/10.1002/rev3.3255 .
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Bruns, Julia, and T. Schopferer. “Eine mustergültige Wissenschaft.” . . TPS – Theorie und Praxis der Sozialpädagogik 11 (2021): 28–32.
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Jensen, Solveig, Hedwig Gasteiger, and Julia Bruns. “Place Value and Regrouping as Seperate Constructs of Place Value Understanding.” In Proceedings of the 44th Conference of the International Group for the Psychology of Mathematics Education, edited by Maitree Inprasitha, Narumon Changsri, and Nisakorn Boonsena, 3:101–9, 2021.
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Bruns, Julia, Hedwig Gasteiger, and Carolin Strahl. “Context and Implications Document for: Conceptualising and Measuring Domain-Specific Content Knowledge of Early Childhood Educators: A Systematic Review.”https://doi.org/10.1002/rev3.3256__Review of Education 9, no. 2 (2021): 539–40.https://doi.org/10.1002/rev3.3256 .
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Jensen, Solveig, Hedwig Gasteiger, and Julia Bruns. “Stellenwertverständnis: Verständnis von Stellenwertprinzip und Bündelungsprinzip als separate Konstrukte.”http://dx.doi.org/10.17877/DE290R-22292__In Beiträge zum Mathematikunterricht 2021, edited by Gesellschaft für Didaktik der Mathematik. WTM-Verlag, 2021.http://dx.doi.org/10.17877/DE290R-22292 .
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Schönherr, Johanna, S. Schukajlow, J. Blomberg, and C. Leopold. “The Role of Strategy-Based Motivation in Mathematical Problem Solving: The Case of Learner-Generated Drawings.”https://doi.org/10.1016/j.learninstruc.2021.101561__Learning and Instruction 80 (2021).https://doi.org/10.1016/j.learninstruc.2021.101561 .
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Black, Tobias, Mario Fuest, and Johannes Lankeit. “Relaxed Parameter Conditions for Chemotactic Collapse in Logistic-Type Parabolic–Elliptic Keller–Segel Systems.”https://doi.org/10.1007/s00033-021-01524-8__Zeitschrift Für Angewandte Mathematik Und Physik 72, no. 3 (2021).https://doi.org/10.1007/s00033-021-01524-8 .
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Black, Tobias, and Chunyan Wu. “Prescribed Signal Concentration on the Boundary: Weak Solvability in a Chemotaxis-Stokes System with Proliferation.”https://doi.org/10.1007/s00033-021-01565-z__Zeitschrift Für Angewandte Mathematik Und Physik 72, no. 4 (2021).https://doi.org/10.1007/s00033-021-01565-z .
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Dröse, Jennifer, S. Prediger, P. Neugebauer, R. D. Danhier, and B. Mertins. “Investigating Students’ Processes of Noticing and Interpreting Syntactic Language Features in Word Problem Solving through Eye-Tracking.”https://doi.org/doi.org/10.29333/iejme/9674n __International Electronic Journal of Mathematics Education, 16(1), Em0625, 2021.https://doi.org/doi.org/10.29333/iejme/9674n  .
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Dröse, Jennifer, and S. Prediger. “Identifying Obstacles Is Not Enough for Everybody – Differential Efficacy of an Intervention Fostering Fifth Graders’ Comprehension for Word Problems.”https://doi.org/doi.org/10.1016/j.stueduc.2020.100953__Studies in Educational Evaluation, 68 (100953), 2021, 1–15.https://doi.org/doi.org/10.1016/j.stueduc.2020.100953 .
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Häsel-Weide, Uta, Simone Seitz, Melina Wallner, Yannik Wilke, and Lara Heckmann. “Mit Aufgaben im inklusiven Mathematikunterricht professionell umgehen - Erkenntnisse einer Interviewstudie mit Lehrpersonen der Sekundarstufe.”https://doi.org/10.21248/qfi.57__QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte 3, no. 1 (2021).https://doi.org/10.21248/qfi.57 .
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Hattermann, Mathias, Uta Häsel-Weide, and Melina Wallner. “Conceptualiziation Processes of 6th Graders for Rotational Symmetry.” In Proceedings of the 44th Conference of the International Group for the Psychology of Mathematics Education , edited by M. Inprasitha, N. Changsri, and N. Boonsena, 3:9–15, 2021.
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Offen, Christian, and Sina Ober-Blöbaum. “Bifurcation Preserving Discretisations of Optimal Control Problems.”https://doi.org/10.1016/j.ifacol.2021.11.099__IFAC-PapersOnLine, 2021.https://doi.org/10.1016/j.ifacol.2021.11.099 .
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arXiv: 2107.13853

Ridderbusch, Steffen, Christian Offen, Sina Ober-Blöbaum, and Paul Goulart. “Learning ODE Models with Qualitative Structure Using Gaussian Processes .”https://doi.org/10.1109/CDC45484.2021.9683426__In 2021 60th IEEE Conference on Decision and Control (CDC), 2896. IEEE, 2021.https://doi.org/10.1109/CDC45484.2021.9683426 .
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arXiv: 2011.05364

Vertovec, Nikolaus, Sina Ober-Blöbaum, and Kostas Margellos. “Multi-Objective Minimum Time Optimal Control for Low-Thrust Trajectory Design,” 1975–80, n.d.
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arXiv: 2103.08813

Jiménez, F., and Sina Ober-Blöbaum. “Fractional Damping Through Restricted Calculus of Variations.” In Nichtlineare Sci 31, Vol. 46. J Nonlinear Sci , 2021.
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Bruns, Julia, Elisabeth Unterhauser, and Hedwig Gasteiger. “Geometrisches Begriffsverständnis in der Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat.”https://doi.org/10.1007/s13138-021-00185-4__Journal für Mathematik-Didaktik 42, no. 2 (2021): 581–623.https://doi.org/10.1007/s13138-021-00185-4 .
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Prediger, Susanne, and Jennifer Dröse. “Fehlerbearbeitung bei mathematischen Textaufgaben – Sprachliche und strategische Fehlerursachen und ihre Bearbeitung.”https://doi.org/doi.org/10.1024/2235-0977/a000330__Lernen und Lernstörungen, 10(2), 2021.https://doi.org/doi.org/10.1024/2235-0977/a000330 .
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Guillarmou, Colin, Joachim Hilgert, and Tobias Weich. “High Frequency Limits for Invariant Ruelle Densities.”https://doi.org/10.5802/ahl.67__Annales Henri Lebesgue 4 (2021): 81–119.https://doi.org/10.5802/ahl.67 .
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arXiv: 1803.06717

Brennecken, Dominik, Joachim Hilgert, and Lorenzo Ciardo. “Algebraically Independent Generators for the Algebra of Invariant Differential Operators on SLn(R)/SOn(R).”https://doi.org/10.48550/arXiv.2008.07479__Journal of Lie Theory 31, no. 2 (2021): 459--468.https://doi.org/10.48550/arXiv.2008.07479 .
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Hilgert, Joachim, and I. Hilgert, eds. Mathematik - Ein Reiseführer 2. Auflage. Springer Spektrum, 2021.
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Hilgert, Joachim, Tobias Weich, and L. Wolf. “Higher-Rank Quantum-Classical Correspondence,” 2021.
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Hilgert, Joachim. “Philip Ording: 99 Variations on a Proof. Princeton University Press 2019.”https://doi.org/10.1007/s00591-021-00295-7__Mathematische Semesterberichte, 2021.https://doi.org/10.1007/s00591-021-00295-7 .
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Hilgert, Joachim. “Georg Glaeser (Hrsg.): 77-mal Mathematik für zwischendurch – Unterhaltsame Kuriositäten und unorthodoxe Anwendungen. Springer Spektrum 2020.”https://doi.org/10.1007/s00591-021-00296-6__Mathematische Semesterberichte, 2021.https://doi.org/10.1007/s00591-021-00296-6 .
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Binz, Tim, and Balázs Kovács. “A Convergent Finite Element Algorithm for Mean Curvature Flow in Higher Codimension.” ArXiv, 2021.
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Binz, Tim, and Balázs Kovács. “A Convergent Finite Element Algorithm for Generalized Mean Curvature Flows of Closed Surfaces.”https://doi.org/10.1093/imanum/drab043__IMA Journal of Numerical Analysis 42, no. 3 (2021): 2545–88.https://doi.org/10.1093/imanum/drab043 .
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Harder, Paula, and Balázs Kovács. “Error Estimates for the Cahn–Hilliard Equation with Dynamic Boundary Conditions.”https://doi.org/10.1093/imanum/drab045__IMA Journal of Numerical Analysis 42, no. 3 (2021): 2589–2620.https://doi.org/10.1093/imanum/drab045 .
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Nick, Jörg, Balázs Kovács, and Christian Lubich. “Correction to: Stable and Convergent Fully Discrete Interior–Exterior Coupling of Maxwell’s Equations.”https://doi.org/10.1007/s00211-021-01196-6__Numerische Mathematik 147, no. 4 (2021): 997–1000.https://doi.org/10.1007/s00211-021-01196-6 .
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Kovács, Balázs, Buyang Li, and Christian Lubich. “A Convergent Evolving Finite Element Algorithm for Willmore Flow of Closed Surfaces.”https://doi.org/10.1007/s00211-021-01238-z__Numerische Mathematik 149, no. 3 (2021): 595–643.https://doi.org/10.1007/s00211-021-01238-z .
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Hesse, Kerstin, Ian H. Sloan, and Robert S. Womersley. “Local RBF-Based Penalized Least-Squares Approximation on the Sphere with Noisy Scattered Data.”https://doi.org/10.1016/j.cam.2020.113061__Journal of Computational and Applied Mathematics 382 (2021).https://doi.org/10.1016/j.cam.2020.113061 .
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Guillarmou, Colin, and Benjamin Küster. “Spectral Theory of the Frame Flow on Hyperbolic 3-Manifolds.”https://doi.org/10.1007/s00023-021-01068-7__Annales Henri Poincaré 22, no. 11 (2021): 3565–3617.https://doi.org/10.1007/s00023-021-01068-7 .
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Rezat, Sebastian, Lianghuo Fan, and Birgit Pepin. “Mathematics Textbooks and Curriculum Resources as Instruments for Change.”https://doi.org/10.1007/s11858-021-01309-3__ZDM – Mathematics Education 53, no. 6 (2021): 1189–1206.https://doi.org/10.1007/s11858-021-01309-3 .
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Rezat, Sebastian, Florian Schacht, and Uta Häsel-Weide. “Challenges of Making Sense of Tasks and Automated Feedback in Digital Mathematics Textbooks.”https://doi.org/10.4324/9781003137580__In Mathematics Education in the Digital Age. Learning, Practice and Theory, edited by A. Clark-Wilson, A. Donevska-Todorova, E. Faggiano, J. Trgalová , and H.-G. Weigang, 168–84. London: Routledge, 2021.https://doi.org/10.4324/9781003137580 .
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Rezat, Sebastian. “How Automated Feedback from a Digital Mathematics Textbook Affects Primary Students’ Conceptual Development: Two Case Studies.”https://doi.org/10.1007/s11858-021-01263-0__ZDM Mathematics Education 53, no. 6 (2021): 1433–45.https://doi.org/10.1007/s11858-021-01263-0 .
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Hochmuth, Reinhard, Rolf Biehler, Werner Blum, Kay Achmetli, Jana Rode, Janina Krawitz, Stanislaw Schukajlow, Peter Bender, and Jürgen Haase. “Fachwissen zur Arithmetik bei Grundschullehramtsstudierenden – Entwicklung im ersten Semester und Veränderungen durch eine Lehrinnovation.”https://doi.org/10.1007/978-3-662-62854-6_24__In Lehrinnovationen in der Hochschulmathematik . Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik, edited by Rolf Biehler, Andreas Eichler, Reinhard Hochmuth, Stefanie Rach, and Niclas Schaper, 611–44. Berlin, Heidelberg: Springer Spektrum, 2021.https://doi.org/10.1007/978-3-662-62854-6_24 .
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Fleischmann, Yael, Rolf Biehler, Alexander Gold, and Tobias Mai. “Integration digitaler Lernmaterialien in die Präsenzlehre am Beispiel des Mathematikvorkurses für Ingenieure an der Universität Paderborn.”https://doi.org/10.1007/978-3-662-62854-6_15__In Lehrinnovationen in der Hochschulmathematik . Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik, edited by Rolf Biehler, Andreas Eichler, Reinhard Hochmuth, Stefanie Rach, and Niclas Schaper, 321–63. Berlin, Heidelberg: Springer Spektrum, 2021.https://doi.org/10.1007/978-3-662-62854-6_15 .
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Gold, Alexander, Yael Fleischmann, Tobias Mai, Rolf Biehler, and Leander Kempen. “Die Online-Lernmaterialien im Online-Mathematikvorkurs studiVEMINT: Konzeption und Ergebnisse von Nutzer- und Evaluationsstudien.”https://doi.org/10.1007/978-3-662-62854-6_16__In Lehrinnovationen in der Hochschulmathematik . Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik, edited by Rolf Biehler, Andreas Eichler, Reinhard Hochmuth, Stefanie Rach, and Niclas Schaper, 365–97. Berlin, Heidelberg: Springer Spektrum, 2021.https://doi.org/10.1007/978-3-662-62854-6_16 .
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