@article{DAN_1976_226_5_a4,
     author = {V. Ya. Ivrii},
     title = {Wave fronts of solutions of some microlocally hyperbolic pseudodifferential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1009--1011},
     publisher = {mathdoc},
     volume = {226},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_5_a4/}
}