@article{DAN_1979_247_4_a16,
     author = {M. A. Sadovskii},
     title = {Natural lumpiness of a rock},
     journal = {Doklady Akademii Nauk},
     pages = {829--831},
     year = {1979},
     volume = {247},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_4_a16/}
}