@article{SEMR_2023_20_2_a9,
     author = {B. S. Baizhanov and O. A. Umbetbayev},
     title = {Constant expansion of theories and the number of countable models},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {1037--1051},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2023_20_2_a9/}
}