Kuczma, Merek. <br/><br/>
Iterative functional equations   
by Merek Kuczma, Bogdan Choczewski and Roman Ger 
 - Cambrdige  Cambridge Univerwity Press  1990 
 - xix, 552p. 
 - Encyclopedia of Mathematics and its Applications .
<br/><br/><label>ISBN: </label>0 521 35561 3 
<br/><br/><label>Dewey Class. No.: </label>515.25  / N90