@article{TMF_1976_27_2_a6,
     author = {E. N. Rumyantseva},
     title = {Neutrino gas in {a~Friedmann} universe},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {190--195},
     year = {1976},
     volume = {27},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1976_27_2_a6/}
}