Shtokalo I Z <br/><br/>
Linear differentila equations with variable coefficients 

 -  1961 
 - p.  cm. 
 - International monographs series .
<br/><br/><label>Standard No.: </label>22293 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B33:1:1, K1