V. M. Buchstaber, “$n$-valued groups: theory and applications”, Mosc. Math. J., 6:1 (2006), 57–84
P. V. Yagodovskii, “$\sigma$-Extensions of discrete multivalued groups”, J. Math. Sci. (N. Y.), 138:3 (2006), 5753–5761
D. V. Gugnin, “On continuous and irreducible Frobenius $n$-homomorphisms”, Russian Math. Surveys, 60:5 (2005), 967–969
A. A. Bolibrukh, A. P. Veselov, A. B. Zhizhchenko, I. M. Krichever, A. A. Mal'tsev, S. P. Novikov, T. E. Panov, Yu. M. Smirnov, “Viktor Matveevich Buchstaber (on his 60th birthday)”, Russian Math. Surveys, 58:3 (2003), 627–635
P. V. Yagodovskii, “Linear deformations of discrete groups and constructions of multivalued groups”, Izv. Math., 64:5 (2000), 1065–1089
V. M. Buchstaber, E. G. Rees, “Frobenius $k$-characters and $n$-ring homomorphisms”, Russian Math. Surveys, 52:2 (1997), 398–399
P. V. Yagodovskii, “Deformations of multivalued groups”, Russian Math. Surveys, 52:3 (1997), 623–624
V. M. Buchstaber, V. Z. Ènol'skii, “Explicit Algebraic Description of Hyperelliptic Jacobians on the Basis of the Klein $\sigma$-Functions”, Funct. Anal. Appl., 30:1 (1996), 44–47