1. V. M. Buhštaber and S. P. Novikov, “Formal groups, power systems and Adams operators,” Mat. Sb. (N. S.) 84 (126) (1), 81–118 (1971).
2. V. M. Buchstaber, “Functional equations associated with addition theorems for elliptic functions and two-valued algebraic groups,” Russian Math. Surveys 45 (3), 213–215 (1990).
3. V. M. Buchstaber and E. G. Rees, “Rings of continuous functions, symmetric products, and Frobenius algebras,” Russian Math. Surveys 59 (1), 125–144 (2004).
4. V. M. Buchstaber, “$$n$$-valued groups: theory and applications,” Mosc. Math. J. 6 (1), 57–84 (2006).
5. A. P. Veselov, “Integrable maps,” Russian Math. Surveys 46 (5), 1–51 (1991).