@article{DAN_1990_312_5_a17,
     author = {A. I. Akhiezer and N. F. Shul'ga},
     title = {On the classical limit for the formula of the quantum theory of radiation},
     journal = {Doklady Akademii Nauk},
     pages = {1102--1105},
     publisher = {mathdoc},
     volume = {312},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_5_a17/}
}