@article{TMF_1983_55_2_a5,
     author = {A. I. Zhuk and V. P. Frolov},
     title = {Quantum particle production in a~homogeneous isotropic universe from states described by a~density matrix},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {216--223},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_55_2_a5/}
}