@article{NANO_2016_7_2_a10,
     author = {A. G. Petrashen and N. V. Sytenko},
     title = {Laser generation without inversion on the fine levels of the helium atom},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {384--393},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2016_7_2_a10/}
}