@article{FAA_1979_13_3_a14,
     author = {V. Ya. Ivrii},
     title = {Propagation of singularities of solutions of nonclassical boundary-value problems for the wave equation},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {85--86},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_3_a14/}
}