Agarwal, Ravi P. ; Grace, Said R. ; O'Regan, Donal <br/><br/>
Oscillation theory for difference and functional differential equations 
/ by Ravi P. Agarwal et.al 
 - Netherland:  Kluwer academic publishers,  2000. 
 - vi, 337p. 
<br/><br/><label>ISBN: </label>0792362896 
<br/><br/><label>Dewey Class. No.: </label>515.625  / AGA/O