@article{DAN_1966_170_5_a17,
     author = {V. F. Kozlov},
     title = {On determining the depth of the zero surface},
     journal = {Doklady Akademii Nauk},
     pages = {1068--1069},
     publisher = {mathdoc},
     volume = {170},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_170_5_a17/}
}