1. Belton, R., Brooks, R., Ebli, S., Fajstrup, L., Fasy, B.T., Ray, C., Sanderson, N., Vidaurre, E.: Towards directed collapsibility. In: Acu, B., Danielli, D., Lewicka, M., Pati, A.N., Ramanathapuram Vancheeswara, S., Teboh-Ewungkem, M.I. (eds.) Advances in Mathematical Sciences, Association for Women in Mathematics Series. Springer, New York (2020)
2. Brown, R., Higgins, P.J.: On the algebra of cubes. J. Pure Appl. Algebra 21(3), 233–60 (1981)
3. Cohen, M.M.: A Course in Simple-Homotopy Theory, vol. 10. Springer Science & Business Media, Berlin (2012)
4. Dijkstra, E.W.: Two starvation-free solutions of a general exclusion problem (1977). Manuscript EWD625, from the archives of UT Austin
5. Fajstrup, L., Goubault, E., Raussen, M.: Algebraic topology and concurrency. Theoret. Comput. Sci. 241–271 (2006)