Yakubovich V A <br/><br/>
Linear differential equations with periodic coefficients.2V. 

 -  1975 
<br/><br/><label>Standard No.: </label>130503 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B33,1, L5.1-.2