@article{DAN_1964_155_1_a8,
     author = {V. V. Krivov},
     title = {The best extremal mappings in space},
     journal = {Doklady Akademii Nauk},
     pages = {38--40},
     publisher = {mathdoc},
     volume = {155},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_1_a8/}
}