Kuczma, Marek <br/><br/>
Introduction to the theory of functional equations and inequalities: Cauchy's equation and Jensen's inequality 
by Marek Kuczma 
 - 2ne ed. 
 - Basel  Birkhauser  2009 
 - xiv, 595p. 
<br/><br/><label>ISBN: </label>9783764387488 
<br/><br/><label>Dewey Class. No.: </label>515.75  / P09