Erugin, Nickolay P. <br/><br/>
Linear systems of ordinary differential equations with periodic and quasi-periodic coefficients 
Nickolay P. Erugin 
 - New York:  Academic Press,  1966. 
 -  271p. 
<br/><br/><br/>eng 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations
<br/><br/><label>Dewey Class. No.: </label>515.352  / ERL