“Description of positively existentially closed models in any class of -structures with unary predicates axiomatizable by any h-universal sentence”. (2011) ҚазҰУ Хабаршысы. Математика, механика, информатика сериясы, 69(2), pp. 39–43. Available at: https://bm.kaznu.kz/index.php/kaznu/article/view/193 (Accessed: 16 July 2026).