@article{TMF_1973_15_2_a8,
     author = {A. A. Arsen'ev},
     title = {On phase shift behavior near resonance},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {259--265},
     year = {1973},
     volume = {15},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_15_2_a8/}
}