Erugin, Nikolay P. <br/><br/>
Linear systems of ordinary differential equations  with periodic and quasi-periodic coeffecients 
Nikolay P. Erugin                                           
 - New York  Academic Press  1966 
 - xxi, 271p. 
 - Mathematics in science and engineering; v. 28 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations<br/>NASA Thesaurus
<br/><br/><label>Universal Decimal Class. No.: </label>517.91  / ERU