Piaggio, H. T. H. An elementary treatise on differential equations and their applications / H. T. H. Piaggio. - First Indian edition. - New Delhi : CBS publishers, c1985 [Reprinted 2000, 2003]. - xv, 256 pages : illustrations ; 22 cm. Includes index. ISBN: 8123909098 Subjects--Topical Terms: Differential equations. Dewey Class. No.: 515.35 PIA