@article{TMF_1988_75_1_a5,
     author = {V. A. Babenko and N. M. Petrov},
     title = {Off-shell two-particle scattering amplitude in the $P$-matrix approach},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {61--69},
     year = {1988},
     volume = {75},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_1_a5/}
}