@article{FPM_2002_8_1_a0,
     author = {A. G. Baskakov},
     title = {Splitting of perturbated differential operators with unbounded operator coefficients},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1--16},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2002_8_1_a0/}
}