@article{DAN_1963_153_4_a6,
     author = {V. L. Rvachev},
     title = {An analytic description of certain geometric objects},
     journal = {Doklady Akademii Nauk},
     pages = {765--767},
     publisher = {mathdoc},
     volume = {153},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_153_4_a6/}
}