Petrovski, I. G. <br/><br/>
Ordinary differential equations   

 - Rev. 
 - New York  Dover  1966 
 - x, 232p. Index, Bibl. 
<br/><br/> "Tr. & ed. by Richard A. Silverman".   
<br/><br/><label>Dewey Class. No.: </label>515.35  / P497.OD