@article{TMF_1972_13_1_a0,
     author = {B. V. Medvedev and V. P. Pavlov and M. K. Polivanov and A. D. Sukhanov},
     title = {Method of extended $S$-matrix in quantum field theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {3--40},
     year = {1972},
     volume = {13},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_13_1_a0/}
}