@article{INTF_1988_33_a1,
     author = {V. Ya. Ivrii},
     title = {Linear hyperbolic equations},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya},
     pages = {157--247},
     year = {1988},
     volume = {33},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTF_1988_33_a1/}
}