Birkhoff, Garrett. <br/><br/>
Ordinary differential equations   
by Garrett Birkhoff,Gian-Carlo Rota 
 - 3rd 
 - New York  John Wiley & Sons  1978 
 - xi, 342p. 
<br/><br/><label>ISBN: </label>047107411X 
<br/><br/><label>Dewey Class. No.: </label>515.352  / N783