@article{UZERU_1991_2_a6,
     author = {G. Idris},
     title = {On the control problem for hyperbolic general equations},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {53--63},
     year = {1991},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_1991_2_a6/}
}