Erbe, L.H., et al <br/><br/>
Oscillation theory for functional differential equations 
L.H. Erbe, et al 
 - New York  Marcel Dekker  1995 
 - vii  482 
 - Monographs & textbooks in pure & applied mathematics 190 .
<br/><br/><label>ISBN: </label>0-8247-9598-9 
<br/><br/><label>Dewey Class. No.: </label>510  / ALO