@article{UZERU_2016_1_a7,
     author = {S. M. Manukyan and A. A. Butavyan and H. M. Manukyan},
     title = {Transmission of narrow sound beams in nonlinear environment},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {45--51},
     publisher = {mathdoc},
     number = {1},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2016_1_a7/}
}