@article{DAN_1965_160_5_a15,
     author = {A. B. Shabat},
     title = {The removability of level sets for solutions to elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1032--1035},
     publisher = {mathdoc},
     volume = {160},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_160_5_a15/}
}