Representations of Free Products by Infinite Unitriangular Matrices over Finite Fields. - Andrij Olijnyk; Vitaly I. Sushchansky (Int. J. Algebra Comput., 2004)

Inverse Semigroups of Partial Automaton Permutations. - Andrij Olijnyk; Vitaly I. Sushchansky; Janusz K. Slupik (Int. J. Algebra Comput., 2010)