V. M. Buchstaber, K. E. Feldman, “The index of an equivariant vector field and addition theorems for Pontryagin classes”, Izv. Math., 64:2 (2000), 223–247
V. M. Buchstaber, E. G. Rees, “Multivalued groups and Hopf $n$-algebras”, Russian Math. Surveys, 51:4 (1996), 727–729
V. G. Gorbunov, “Symplectic cobordism of the projective spaces”, Math. USSR-Sb., 69:2 (1991), 543–557
V. M. Buchstaber, “Functional equations associated with addition theorems for elliptic functions and two-valued algebraic groups”, Russian Math. Surveys, 45:3 (1990), 213–215
A. N. Kholodov, “The umbral calculus on multivalued formal groups, and Adams projections in $K$-theory”, Math. USSR-Sb., 65:2 (1990), 423–437
A. N. Kholodov, “Multidimensional two-valued commutative formal groups”, Russian Math. Surveys, 43:1 (1988), 243–244
G. L. Litvinov, “Hypergroups and hypergroup algebras”, J. Soviet Math., 38:2 (1987), 1734–1761
V. M. Buchstaber, A. N. Kholodov, “Topological constructions connected with many-valued formal groups”, Math. USSR-Izv., 20:1 (1983), 1–25
R. G. Nadiradze, “Involutions on Stong manifolds and their application in cobordism theory”, Russian Math. Surveys, 35:3 (1980), 264–267