@article{UZERU_2012_3_a5,
     author = {L. P. Tepoyan and H. S. Grigoryan},
     title = {On degenerate nonself-adjoint differential equations of fourth order},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {29--33},
     publisher = {mathdoc},
     number = {3},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2012_3_a5/}
}