Geodesic
Spectrum and structure of large-scale oscillations of the galactic gas layer
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1985), pp. 53-59

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The perturbations of the polytropic gaseous layer are studied taking into account the rotation in the gravitational field of the spheroidal stellar component of the Galaxy. The spectrum of large- and small-scale oscillations of the layer and the corresponding spatial structures of perturbations are obtained. The possibilities of interpreting the observed large-scale structures of the gaseous layer of the Galaxy as normal modes of the layer oscillations are discussed. 
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     author = {M. G. Abrahamian and S. V. Arutyunyan},
     title = {Spectrum and structure of large-scale oscillations of the galactic gas layer},
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     pages = {53--59},
     publisher = {mathdoc},
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M. G. Abrahamian; S. V. Arutyunyan. Spectrum and structure of large-scale oscillations of the galactic gas layer. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1985), pp. 53-59. http://geodesic.mathdoc.fr/item/UZERU_1985_3_a7/