Malyshev V, Kazhikenova S, Makasheva A, Kazhikenova A. Isomorphism Theorems of a Series Sum and the Improper Integral. M [Internet]. 2024 Mar. 29 [cited 2025 Sep. 4];113(1):128-39. Available from: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/689