@article{DAN_1963_150_3_a14,
     author = {Yu. A. Anan'ev and V. P. Gribkovskiǐ and A. A. Mak and B. I. Stepanov},
     title = {The properties of an optical quantum generator having four levels},
     journal = {Doklady Akademii Nauk},
     pages = {507--510},
     publisher = {mathdoc},
     volume = {150},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_3_a14/}
}