Geodesic
On the behaviour of 3 $kpc$ and 135 $km/s$ ‘‘arms” of the Galaxy
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1989), pp. 42-48

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The possibility of strongly non-linear ring-like density waves propagation in the gaseous thin disk has been established; The problem of the 3-$kpc$ and 135-$km/s$ ‘‘arms” of the Galaxy as strong non-linear waves caused by an explosion in the Galactic centre has been discussed. 
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     author = {M. G. Abrahamian},
     title = {On the behaviour of 3 $kpc$ and 135 $km/s$ {\textquoteleft}{\textquoteleft}arms{\textquotedblright} of the {Galaxy}},
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M. G. Abrahamian. On the behaviour of 3 $kpc$ and 135 $km/s$ ‘‘arms” of the Galaxy. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1989), pp. 42-48. http://geodesic.mathdoc.fr/item/UZERU_1989_1_a6/