Aczel, J. <br/><br/>
Functional equations in several variables / 
J. Aczel, J. Dhombres 
 - Cambridge, England :  Cambridge University Press,  c1989 
 - xiii, 462 p. :  ill. ;  25 cm. 
 - Encyclopedia of mathematics and its applications ;  v. 31 .
 - Encyclopedia of mathematics and its applications .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780521352765 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Functional equations<br/>Functions of several real variables