@article{DAN_1969_186_3_a19,
     author = {B. N. Petrov and V. A. Viktorov and B. V. Lunkin},
     title = {On the measurement of the amount of medium in a closed space},
     journal = {Doklady Akademii Nauk},
     pages = {564--567},
     publisher = {mathdoc},
     volume = {186},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_3_a19/}
}