@article{MMO_1979_39_a1,
     author = {V. Ya. Ivriǐ},
     title = {Wave fronts of solutions of certain pseudodifferential equations},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {49--82},
     publisher = {mathdoc},
     volume = {39},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1979_39_a1/}
}