Geodesic
The nonlinear perturbations of gravitating disk and spiral structure of galaxies
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1988), pp. 70-77.

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The nonlinear perturbations of Jeans unstable disks have been investigated and the problem of spiral structure of galaxies from the viewpoint of the nonlinear theory has been considered. 
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M. G. Abrahamian; V. I. Petviashvili; A. M. Fridman. The nonlinear perturbations of gravitating disk and spiral structure of galaxies. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1988), pp. 70-77. http://geodesic.mathdoc.fr/item/UZERU_1988_3_a8/

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