Boyce, William E. <br/><br/>
Elementry differential equations and boundary value problems and elementry deffe 
William E. Boyce 
 - 4th ed. 
 - New York  John Wiley  1986 
 - 279p. 
<br/><br/><label>ISBN: </label>047187096X 
<br/><br/><label>Dewey Class. No.: </label>515.35 B692E-4