@article{VNGU_2018_18_1_a0,
     author = {S. A. Aleksandrova},
     title = {On $\Sigma$-definability of hereditarily finite and list superstructures},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {3--10},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2018_18_1_a0/}
}