Lefschetz Solomon <br/><br/>
Differential equations   Geometric theory    

 - 2 
 -  1962 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Equations
<br/><br/><label>Dewey Class. No.: </label>B33, K2