Lefschetz, Solomon <br/><br/>
Differential Equations:Geometric Theory 
Lefschetz, Solomon 
 - New York  Dover  1977 
 - 375  Illustration,index & reference 
<br/><br/><label>ISBN: </label>486634639 
<br/><br/><label>Dewey Class. No.: </label>515  / L5222