- Sergey V. Gusev, Boris M. Vernikov, “Two weaker variants of congruence permutability for monoid varieties”, Semigroup Forum, 103, № 1, 2021, 106
- Edmond W. H. Lee, “A minimal pseudo-complex monoid”, Arch. Math., 120, № 1, 2023, 15
- Sergey V. Gusev, “Varieties of aperiodic monoids with central idempotents whose subvariety lattice is distributive”, Monatsh Math, 201, № 1, 2023, 79
- Edmond W. H. Lee, “On Certain Cross Varieties of Aperiodic Monoids with Commuting Idempotents”, Results. Math., 66, № 3-4, 2014, 491
- E. W. H. Lee, “Inherently Non-Finitely Generated Varieties of Aperiodic Monoids with Central Idempotents”, J Math Sci, 209, № 4, 2015, 588
- Sergey V. Gusev, Edmond W. H. Lee, Boris M. Vernikov, “The lattice of varieties of monoids”, Jpn. J. Math., 17, № 2, 2022, 117
- S. V. Gusev, “A new example of a limit variety of monoids”, Semigroup Forum, 101, № 1, 2020, 102
- Edmond W. H. Lee, Advances in the Theory of Varieties of Semigroups, 2023, 227
- Sergey V. Gusev, Edmond W. H. Lee, “Varieties of monoids with complex lattices of subvarieties”, Bull. London Math. Soc., 52, № 4, 2020, 762