@article{TMF_1984_58_3_a2,
     author = {A. I. Ignat'ev and V. S. Polikanov},
     title = {Multichannel {Green's} functions and perturbation theory for multichannel problems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {338--342},
     publisher = {mathdoc},
     volume = {58},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_58_3_a2/}
}