%0 Journal Article %A V. S. Ol'khovskii %T Properties of unitary and nonunitary $S$-matrix on the basis of causality and the completeness condition of wave functions %J Teoretičeskaâ i matematičeskaâ fizika %D 1974 %P 211-222 %V 20 %N 2 %U http://geodesic.mathdoc.fr/item/TMF_1974_20_2_a7/ %G ru %F TMF_1974_20_2_a7