@article{TMF_1986_67_1_a10,
     author = {N. N. Bogolyubov (Jr.) and A. N. Kireev and A. M. Kurbatov},
     title = {Method of time-ordered products in polaron theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {115--128},
     publisher = {mathdoc},
     volume = {67},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1986_67_1_a10/}
}