@article{DAN_1965_165_1_a15,
     author = {N. G. Basov and R. V. Ambartsumyan and V. S. Zuev and P. G. Kryukov and V. S. Letokhov},
     title = {The propagation velocity of a powerful light pulse in inversely populated medium},
     journal = {Doklady Akademii Nauk},
     pages = {58--60},
     publisher = {mathdoc},
     volume = {165},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_1_a15/}
}