@article{DAN_1975_220_5_a3,
     author = {M. G. Gasymov and B. A. Iskenderov},
     title = {The principle of limiting amplitude for a hyperbolic equation with constant coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {1012--1014},
     year = {1975},
     volume = {220},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_5_a3/}
}