Mahamadiyeva Aziza Sherali qizi, and Tursinova Sokhiba Ravshon qizi, Khojakulova Nozima Abduhamid qizi. “DIVISIBILITY RULES FOR 13: MATHEMATICAL PROOFS AND PRACTICAL ALGORITHMS”. Ethiopian International Multidisciplinary Research Conferences, vol. 3, no. 2, May 2026, pp. 108-9, https://eijmr.org/conferences/index.php/eimrc/article/view/2234.