1. A mathematical theory of origami constructions and numbers;Alperin;New York J. Math.,2000
2. When can you fold a map?;Arkin;Comput. Geom.,2004
3. M. Bern, B. Hayes, The complexity of flat origami, in: Proceedings of the 7th Annual ACM–SIAM Symposium on Discrete Algorithms, 1996, pp. 175–183
4. On total differential inclusions;Bressan;Rend. Sem. Mat. Univ. Padova,1994
5. On a problem of potential wells;Cellina;J. Convex Anal.,1995