@article{DAN_1965_161_4_a17,
     author = {N. G. Basov and \`E. M. Belenov and V. S. Letokhov},
     title = {Limit cross section of the radiation beam from an optical quantum generator},
     journal = {Doklady Akademii Nauk},
     pages = {799--801},
     publisher = {mathdoc},
     volume = {161},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_4_a17/}
}