@article{DAN_1977_234_6_a12,
     author = {S. P. Vyatchanin},
     title = {On effective cooling of quantum systems},
     journal = {Doklady Akademii Nauk},
     pages = {1295--1297},
     publisher = {mathdoc},
     volume = {234},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_6_a12/}
}