@article{DAN_1968_182_6_a15,
     author = {L. Sh. Khodzhaev},
     title = {Generalized {Bogolyubov} functions and the elements of the causal $S$-matrix},
     journal = {Doklady Akademii Nauk},
     pages = {1296--1299},
     publisher = {mathdoc},
     volume = {182},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_182_6_a15/}
}