@article{DAN_1973_213_1_a17,
     author = {V. N. Popov and A. A. Kiselev},
     title = {Diagram technique in the general perturbation theory},
     journal = {Doklady Akademii Nauk},
     pages = {70--73},
     publisher = {mathdoc},
     volume = {213},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_1_a17/}
}