1.
Grigorian SA, Khorkova TA. On $w$-extensions of the abelian semigroups. Armenian Journal of Mathematics. Armen.J.Math. [Internet]. 2009 Jun. 4 [cited 2025 Apr. 3];2(2):73-6. Available from: https://armjmath.sci.am/index.php/ajm/article/view/54