@article{TMF_1984_60_1_a15,
     author = {I. P. Bazarov and P. N. Nikolaev},
     title = {Perturbation theory for anharmonic crystals},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {156--160},
     publisher = {mathdoc},
     volume = {60},
     number = {1},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_60_1_a15/}
}