%0 Journal Article %A O. V. Viskov %T Schwinger's formula for the scalar product %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2005 %P 380-381 %V 60 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_2005_60_2_a20/ %G en %F RM_2005_60_2_a20