1.
Kulpeshov B, Sudoplatov S. On behaviour of 2-formulas in ordered theories with non-maximal number of countable models. M [Internet]. 2016 Mar. 30 [cited 2025 Aug. 28];81(1):68-75. Available from: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/80