Boyce, William E. Elementary differential equations and boundary value problems / William E. Boyce, Richard C. DiPrima. - 4th ed. - Wiley, c1986. - xvi, 654, [49] p. : ill. ; 25 cm. Includes bibliographies and index. ISBN: 0471078956 LCCN: 85020244 Subjects--Topical Terms: Differential equations.Boundary value problems. Subjects--Index Terms: მათემატიკა დიფერენციალური განტოლებები LC Class. No.: QA371 / .B773 1986 Dewey Class. No.: 515.3/5 Universal Decimal Class. No.: 517.91