Stasyuk, Ya.Z., and O.B. Skaskiv. 2009. “On the Equivalence of the Sum and the Maximal Term of the Dirichlet Series Absolutely Convergent in the Half-Plane”. Carpathian Mathematical Publications 1 (1):100-106. https://ktipe.pnu.edu.ua/index.php/cmp/article/view/4007.