%0 Journal Article %A M. M. Anzin %T On variations of positive quadratic forms (with applications to the study of perfect forms) %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1991 %P 11-26 %V 196 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1991_196_a1/ %G ru %F TM_1991_196_a1