Apostol, Tom M. creator text New York John Wiley and Sons 1997 monographic XVI,347p. Algebras, Linear Differential equations 512.5APO 0471174211 (hardcover) 9780471174219 (hardcover) http://www.amazon.com/exec/obidos/ASIN/0471174211/chopaconline-20 http://www.amazon.com/exec/obidos/ASIN/0471174211/chopaconline-20