@article{DAN_1973_212_1_a18,
     author = {V. S. Letokhov and A. A. Makarov and E. A. Ryabov},
     title = {The determination of population
},
     journal = {Doklady Akademii Nauk},
     pages = {75--78},
     publisher = {mathdoc},
     volume = {212},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_1_a18/}
}