Grossman, Stanley.
Elementary differential equations. - Massachussetts : Addison-Wesley, 1996. - 4th ed. 403p., index, appendix. ; cm.
0673985547
Differential Equations.
QA371.D438
Elementary differential equations. - Massachussetts : Addison-Wesley, 1996. - 4th ed. 403p., index, appendix. ; cm.
0673985547
Differential Equations.
QA371.D438