Nemstskii, V.V.  . <br/><br/>
Qualitative theory of differential equations /  
by V.V. Nemytskii and V.V. Stepanov. 
 - New York :   Dover Publications, INC. ,   1989 
 - 523p ;  
<br/><br/><label>ISBN: </label>0-486-65954-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B33  / M9