@article{UZERU_2004_1_a1,
     author = {A. H. Petrosyan and I. G. Khachatryan},
     title = {About expantion by eigen functions self-adjoint differential operator's with coefficients having precise behavior in infinity},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {22--27},
     publisher = {mathdoc},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2004_1_a1/}
}