@article{DVMG_2021_21_1_a8,
     author = {A. G. Podgaev and T. D. Kulesh},
     title = {Compactness theorems for problems with unknown boundary},
     journal = {Dalʹnevosto\v{c}nyj matemati\v{c}eskij \v{z}urnal},
     pages = {105--112},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DVMG_2021_21_1_a8/}
}