Egorov, IU. V. Linear differential equations of principal type/ Yu. V. Egorov ; translated from Russian by Dang Prem Kumar. - New York London: Consultants Bureau, c1986. - vii, 301 p. ; 26 cm. - Contemporary Soviet mathematics. . Translation of: LineÁinye different²sial#nye uravnenii²a glavnogo tipa. Bibliography: p. 285-301. ISBN: 0306109921 LCCN: 86025408 Nat. Bib. No.: GB88-17940 Subjects--Topical Terms: Differential equations, Linear. Dewey Class. No.: 515.35 / E31l