@article{TMF_1970_2_1_a6,
     author = {L. A. Sakhnovich},
     title = {Generalized wave operators and regularization of perturbation series},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {80--86},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_2_1_a6/}
}