Gaifullin A.A., Neretin Yu.A., “Infinite Symmetric Group, Pseudomanifolds, and Combinatorial Cobordism-Like Structures”, J. Topol. Anal., 10:3 (2018), 605–625
P. V. Yagodovsky, “Duality in the theory of finite commutative multivalued groups”, J. Math. Sci. (N. Y.), 174:1 (2011), 97–119
A. A. Gaifullin, P. V. Yagodovskii, “Integrability of $m$-valued dynamics by means of single-generated $m$-valued groups”, Russian Math. Surveys, 62:1 (2007), 181–183