@article{UZERU_1988_3_a8,
     author = {M. G. Abrahamian and V. I. Petviashvili and A. M. Fridman},
     title = {The nonlinear perturbations of gravitating disk and spiral structure of galaxies},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {70--77},
     publisher = {mathdoc},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_1988_3_a8/}
}