E. C. Krasko, I. N. Labutin, A. V. Omelchenko, “Enumeration of labelled and unlabelled Hamiltonian cycles in complete $k$-partite graphs”, Zap. Nauchn. Sem. POMI, 488 (2019), 119–142
E. C. Krasko, I. N. Labutin, D. N. Moskvin, A. V. Omelchenko, A. I. Khrabrov, “On some enumerative problems of lambda calculus”, Zap. Nauchn. Sem. POMI, 475 (2018), 99–121