@article{DE_1981_17_9_a17,
     author = {L. I. Vainerman},
     title = {Maximal dissipativity of abstract differential operators of hyperbolic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1678--1681},
     year = {1981},
     volume = {17},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_9_a17/}
}