%0 Journal Article %A G. I. Laptev %T Mathematical features of the problem on the penetration of a~magnetic field into a~substance for quasistationary approximation %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1989 %P 70-73 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1989_7_a12/ %G ru %F IVM_1989_7_a12