@article{DAN_1981_258_3_a18,
     author = {E. V. Radkevich},
     title = {Boundary-variation method in problems involving a stationary fresh-water lens},
     journal = {Doklady Akademii Nauk},
     pages = {586--589},
     year = {1981},
     volume = {258},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_258_3_a18/}
}