Yeshkeyev, A.R., M.T. Kassymetova, and O.I. Ulbrikht. “Criterion for the Cosemanticness of the Abelian Groups in the Enriched Signature”. Bulletin of the Karaganda University. Mathematics Series 89, no. 1 (March 30, 2018): 49–60. Accessed July 10, 2025. https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/213.