TY JOUR TI Hafnian of two-parameter matrices KW hafnian KW matching KW weighted graph KW Toeplitz matrix KW arc diagram KW triangular lattice JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Efimov, D.. PY 2022 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"