Alt, Helmut, et al. “Approximate Matching of Polygonal Shapes.” Annals of Mathematics and Artificial Intelligence, vol. 13, no. 3, 1995.

Blömer, Johannes, et al. An XOR-Based Erasure-Resilient Coding Scheme. 1995.

Blömer, Johannes. On Kummer Theory and the Number of Roots of Unity in Radical Extensions of Q. Technical Report, Freie Universität Berlin, Fachbereich Mathematik und Informatik, 1993.

Blömer, Johannes. Simplifying Expressions Involving Radicals. PhD thesis, Freie Universität Berlin, Fachbereich Mathematik und Informatik, 1992.

Alt, Helmut, and Johannes Blömer. “Resemblance and Symmetries of Geometric Patterns.”10.1007/3-540-55488-2_19__Data Structures and Efficient Algorithms, Springer Berlin Heidelberg, 1992, pp. 1–24, doi:10.1007/3-540-55488-2_19.

Blömer, Johannes. “How to Denest Ramanujan’s Nested Radicals.”10.1109/sfcs.1992.267807__Proceedings., 33rd Annual Symposium on Foundations of Computer Science, IEEE, 1992, doi:10.1109/sfcs.1992.267807.

Alt, Helmut, et al. “Approximate Matching of Polygonal Shapes (Extended Abstract).”10.1145/109648.109669__Proceedings of the Seventh Annual Symposium on Computational Geometry  - SCG ’91, ACM Press, 1991, doi:10.1145/109648.109669.

Blömer, Johannes. “Computing Sums of Radicals in Polynomial Time.”10.1109/sfcs.1991.185434__Proceedings 32nd Annual Symposium of Foundations of Computer Science, IEEE Comput. Soc. Press, 1991, doi:10.1109/sfcs.1991.185434.

Alt, Helmut, et al. “Approximation of Convex Polygons.”10.1007/bfb0032068__Automata, Languages and Programming, Springer-Verlag, 1990, pp. 703–16, doi:10.1007/bfb0032068.