A. A. Stepanova, E. L. Efremov, “Axiomatizability of the class of subdirectly irreducible $S$-acts over a commutative monoid”, Algebra Logika, 62:2 (2023), 266–296
2021
2.
A. A. Stepanova, E. L. Efremov, “The primitive normality of a class of weakly injective $S$-acts”, Sibirsk. Mat. Zh., 62:3 (2021), 640–658; Siberian Math. J., 62:3 (2021), 521–536
2020
3.
E. L. Efremov, “Primitive normality and primitive connectedness of the class of injective $S$-acts”, Algebra Logika, 59:2 (2020), 155–168; Algebra and Logic, 59:2 (2020), 103–113
E. L. Efremov, “Completeness and stability of the class of injective
$S$-acts”, Algebra Logika, 59:1 (2020), 48–65; Algebra and Logic, 59:1 (2020), 33–45
E. L. Efremov, A. A. Stepanova, “Axiomatizability of the class of weakly injective $S$-acts”, Sibirsk. Mat. Zh., 58:4 (2017), 785–795; Siberian Math. J., 58:4 (2017), 611–618