1. S.A. Naimpally, J.F. Peters, Topology with Applications. Topological Spaces via Near and Far (World Scientific, Singapore, 2013), xv + 277pp. American Mathematical Society MR3075111
2. P. Alexandroff, H. Hopf, Topologie. Band I (Springer, Berlin, 1935), Zbl 13, 79, iii+637pp. Reprinted Chelsea Publishing Co., Bronx, N. Y., 1972, MR0345087
3. J.H.C. Whitehead, Simplicial spaces, nuclei and m-groups. Proc. Lond. Math. Soc. 45, 243–327 (1939)
4. J.H.C. Whitehead, Combinatorial homotopy I. Bull. Am. Math. Soc. 55(3), 213–245 (1949). Part 1
5. M.Z. Ahmad, J.F. Peters, Maximal centroidal vortices in triangulations. a descriptive proximity framework in analyzing object shapes. Theory Appl. Math. Comput. Sci. 8(1), 38–59 (2018). ISSN 2067-6202