%0 Journal Article %A A. A. Lobashev %A V. M. Mostepanenko %T Quantum effects in nonlinear insulating materials in the presence of a~nonstationary electromagnetic field %J Teoretičeskaâ i matematičeskaâ fizika %D 1991 %P 438-447 %V 86 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1991_86_3_a12/ %G ru %F TMF_1991_86_3_a12