@article{TMF_1970_5_2_a3,
     author = {I. A. Batalin and E. S. Fradkin},
     title = {Quantum electrodynamics in external {fields.~I}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {190--218},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_5_2_a3/}
}