Birkhoff, Garrett  <br/><br/>
Ordinary differential equations [4th ed.] 

 - 4th ed. 
 - Hoboken  John Wiley and Sons  1989 
 - xi, 399p. ; 23 cm. 
<br/><br/><label>ISBN: </label>9780471860037 0471860034 
<br/><br/><label>Subjects--Index Terms: </label>Mathematics Differential equations MA621 
<br/><br/><label>Dewey Class. No.: </label>515.352  / BIR