TY - JOUR AU - A. I. Zhuk AU - V. P. Frolov TI - Quantum particle production in a~homogeneous isotropic universe from states described by a~density matrix JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1983 SP - 216 EP - 223 VL - 55 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1983_55_2_a5/ LA - ru ID - TMF_1983_55_2_a5 ER -