%0 Journal Article %A O. S. Parasyuk %T Hadamard's multiplication theorem and the analytical continuation of the two-particle unitarity condition %J Doklady Akademii Nauk %D 1962 %P 1247-1248 %V 145 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1962_145_6_a14/ %G ru %F DAN_1962_145_6_a14