@article{DAN_1990_311_4_a20,
     author = {L. A. Vainshtein and A. I. Kleev},
     title = {Cooperative emission by electrons-oscillators},
     journal = {Doklady Akademii Nauk},
     pages = {862--866},
     publisher = {mathdoc},
     volume = {311},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a20/}
}