B. Mamadaliyev, and M. Rahmanov. “COMPARISON OF RIMAN, LEBEG, LEBEG-STILTES, RIMAN-STILTES INTEGRALS”. Galaxy International Interdisciplinary Research Journal, vol. 11, no. 4, Apr. 2023, pp. 1065-8, https://internationaljournals.co.in/index.php/giirj/article/view/3952.