@article{DAN_1964_154_4_a16,
     author = {A. G. Doroshkevich and I. D. Novikov},
     title = {Mean radiation density in {Metagalaxy} and some problems of relativistic cosmology},
     journal = {Doklady Akademii Nauk},
     pages = {809--811},
     publisher = {mathdoc},
     volume = {154},
     number = {4},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_154_4_a16/}
}