Feshchenko S F and others <br/><br/>
Asymptotic methods in the theory of linear deffirential equations 

 - New York  American elsevier publishing company inc       1967 
 - xvi,267p.  cm. 
 - Studies in Economics and Political Science, Ed. by W Pember Reeves,17 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>B333,1, K7