S. V. Gusev, E. W. H. Lee, “Cancellable elements of the lattice of monoid varieties”, Acta Math. Hungar., 165, № 1, 2021, 156
Edmond W. H. Lee, “Almost Cross varieties of aperiodic monoids with central idempotents”, Beitr Algebra Geom, 54, № 1, 2013, 121
Sergey V. Gusev, Olga B. Sapir, “Classification of limit varieties of 𝒥-trivial monoids”, Communications in Algebra, 50, № 7, 2022, 3007
Edmond W. H. Lee, Jian Rong Li, “The variety generated by all monoids of order four is finitely based”, Glas. Mat. Ser. III, 50, № 2, 2015, 373