Umbetbayev Olzhas Asylbekovich

Publications in Math-Net.Ru

1. Non-orthogonality of 1-types in theories with a linear order
   
   Bulletin of Irkutsk State University. Series Mathematics, 53 (2025),  131–140
2. Constant expansion of theories and the number of countable models
   
   Sib. Èlektron. Mat. Izv., 20:2 (2023),  1037–1051