@inproceedings{65719,
  author       = {{Stoppel, Hans-Jürgen}},
  editor       = {{Doorman, Michiel and Schäfer, Elena and Maaß, Katja}},
  location     = {{Limassol, Cyprus}},
  publisher    = {{Verlag für wissenschaftliche Texte und Medien}},
  title        = {{{Construction of Polygons with Scratch and Computational Thinking}}},
  year         = {{2026}},
}

@article{65657,
  author       = {{Hoffmann, Jan Sören and Stoppel, Hans-Jürgen}},
  journal      = {{mathematik lehren}},
  number       = {{253}},
  pages        = {{8--12}},
  title        = {{{Das Sieb des Eratosthenes}}},
  year         = {{2025}},
}

@inproceedings{65721,
  author       = {{Stoppel, Hans-Jürgen and Hüsing, Sven}},
  editor       = {{Schick, Lisa and Platz, Melanie and Lambert, Anselm}},
  location     = {{Saarbrücken}},
  pages        = {{1246--1249}},
  publisher    = {{Verlag für wissenschaftliche Texte und Medien}},
  title        = {{{Konstruktionistisches Geometrielernen durch epistemisches Programmieren in Scratch}}},
  year         = {{2025}},
}

@article{65714,
  author       = {{Stoppel, Hans-Jürgen and May, Michel}},
  journal      = {{mathemathik lehren}},
  publisher    = {{Friedrich Verlag}},
  title        = {{{Mathematik mit Scratch}}},
  volume       = {{253}},
  year         = {{2025}},
}

@article{65712,
  author       = {{Stoppel, Hans-Jürgen}},
  journal      = {{mathemathik lehren}},
  pages        = {{20--26}},
  publisher    = {{Friedrich Verlag}},
  title        = {{{Entlang der Vielecke}}},
  volume       = {{253}},
  year         = {{2025}},
}

@article{65713,
  author       = {{Stoppel, Hans-Jürgen and Plangg, Simon and Büscher, Carina}},
  journal      = {{mathemathik lehren}},
  number       = {{253}},
  pages        = {{2--7}},
  publisher    = {{Friedrich Verlag}},
  title        = {{{Mathematik weiterdenken - Wie informatisches Denken die Mathematik stärkt}}},
  year         = {{2025}},
}

@inproceedings{65723,
  abstract     = {{This study aims to investigate student spatial reasoning, thinking, strategies, interests, and
challenges across four different countries in the context of collaborative group problem
solving. The researchers used a problem solving scenario with groups of students that involved
painting the outside of a cube, which was composed of 216 cubes (6 × 6 × 6). the four
countries, findings were mostly consistent among the student collaborative groups with some
variation of problem solving strategies employed. One challenge encountered across the
research sites was student understanding of what the problem was asking. Overall, students
were observed to be engaged and interested in this spatial reasoning problem solving scenario
with some students expressing interest in having to visualize the exterior and interior cubes for
the problem they were required to solve.}},
  author       = {{Stoppel, Hans-Jürgen and Arnal-Palacián, Monica and Catanuto, Roberto and Czarnocha, Bronislaw and Evans, Brian R. and Marciniak, Malgorzata Aneta and Shvartsberg, Yana}},
  location     = {{Sydney, Australia}},
  title        = {{{Strategies, interests, and challenges in a spatial problem solving in different scenarios}}},
  year         = {{2024}},
}

@inproceedings{65720,
  author       = {{Stoppel, Hans-Jürgen}},
  editor       = {{Ebers, Patrick and Rösken, Fabian and Barzel, Bärbel and Büchter, Andreas and Schacht, Florian and Scherer, Petra}},
  location     = {{Essen}},
  publisher    = {{Verlag für wissenschaftliche Texte und Medien}},
  title        = {{{MINT-Unterricht – undenkbar für Lehrkräfte ohne mathematisches Hintergrundwissen}}},
  year         = {{2024}},
}

@book{65710,
  author       = {{Stoppel, Hans-Jürgen and Griese, Birgit}},
  isbn         = {{9783662637432}},
  issn         = {{2626-613X}},
  publisher    = {{Springer Berlin Heidelberg}},
  title        = {{{Übungsbuch zur Linearen Algebra}}},
  doi          = {{10.1007/978-3-662-63744-9}},
  year         = {{2022}},
}

@book{65709,
  author       = {{Stoppel, Hans-Jürgen}},
  isbn         = {{9783658249120}},
  issn         = {{2523-8604}},
  publisher    = {{Springer Fachmedien Wiesbaden}},
  title        = {{{Beliefs und selbstreguliertes Lernen}}},
  doi          = {{10.1007/978-3-658-24913-7}},
  year         = {{2018}},
}