Birkhoff, G. <br/><br/>
Ordinary differential equations 

 - New York  Ginn and company  1962 
 - vi,318p. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Differential Equations ordinary
<br/><br/><label>Dewey Class. No.: </label>515.35  / B55O