Description of positively existentially closed models in any class of -structures with unary predicates axiomatizable by any h-universal sentence. JMMCS [Интернет]. 28 июнь 2011 г. [цитируется по 14 июль 2026 г.];69(2):39-43. доступно на: https://bm.kaznu.kz/index.php/kaznu/article/view/193