@article{DAN_1968_181_3_a20,
     author = {L. A. Khalfin},
     title = {Permissibility conditions for the distributions of unstable particle masses},
     journal = {Doklady Akademii Nauk},
     pages = {584--586},
     publisher = {mathdoc},
     volume = {181},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_3_a20/}
}