@article{TMF_1970_2_2_a1,
     author = {V. A. Kolkunov},
     title = {$S$-matrix problems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {169--180},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_2_2_a1/}
}