Some easily derivable integer sequences. Liskovets, Valery A. — 2000 Journal of Integer Sequences [electronic only]
A multivariate arithmetic function of combinatorial and topological significance. Liskovets, Valery A. — 2010 Integers
Enumerative formulae for unrooted planar maps: a pattern. Liskovets, Valery A. — 2004 The Electronic Journal of Combinatorics [electronic only]