%0 Journal Article %A A. N. Suprun %T Methods of extending the class of operators of the theory of viscoelasticity %J Doklady Akademii Nauk %D 1977 %P 1323-1326 %V 236 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1977_236_6_a9/ %G ru %F DAN_1977_236_6_a9