@article{TMF_1974_20_2_a7,
     author = {V. S. Ol'khovskii},
     title = {Properties of unitary and nonunitary $S$-matrix on the basis of causality and the completeness condition of wave functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {211--222},
     year = {1974},
     volume = {20},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_20_2_a7/}
}