%0 Journal Article %A S. M. Manukyan %A A. A. Butavyan %A H. M. Manukyan %T Transmission of narrow sound beams in nonlinear environment %J Proceedings of the Yerevan State University. Physical and mathematical sciences %D 2016 %P 45-51 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/UZERU_2016_1_a7/ %G en %F UZERU_2016_1_a7