@article{TMF_2019_199_1_a6,
     author = {V. A. Khangulyan},
     title = {A~unitarity criterion for the~partial $S$-matrix of resonance scattering},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {123--133},
     publisher = {mathdoc},
     volume = {199},
     number = {1},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2019_199_1_a6/}
}