Ladde, G.S. <br/><br/>
Oscillation Theory of Differential Equations with Deviating Arguments 
/by G.S. Ladde et al.  
 - New York  Marcel Dekker  1987 
 - vi 308 p. 
<br/><br/><label>ISBN: </label>0-8247-7738-7 
<br/><br/><label>Dewey Class. No.: </label>515.35  / LAD/O