Finitely Based, Finite Sets of Words. - Marcel Jackson; Olga Sapir (Int. J. Algebra Comput., 2000)

Finitely Based Words. - Olga Sapir (Int. J. Algebra Comput., 2000)

A construction of a finitely presented semigroup containing an infinite square-free ideal with zero multiplication. - Ilya Ivanov-Pogodaev; Sergey Malev; Olga Sapir (Int. J. Algebra Comput., 2018)