Boruvka, O. Linear differential transformations of the second order/ translated [from the German] by F. M. Arscott. - London: English Universities Press, 1971. - xvi, 254 p.: 24 cm. Revised translation of Lineare Differentialtransformationen 2. Ordnung. Bibliography: p. [243]-249. ISBN: 0340124083 LCCN: 72176139 //r85 Nat. Bib. No.: B71-30495 Subjects--Topical Terms: Differential equations, Linear.Transformations (Mathematics) Dewey Class. No.: 515.35 / B739l