@article{DAN_1989_304_2_a12,
     author = {A. Fraguela Collar},
     title = {On the problem of the oscillations of a free boundary of an ideal},
     journal = {Doklady Akademii Nauk},
     pages = {313--317},
     publisher = {mathdoc},
     volume = {304},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_2_a12/}
}