The traveling salesman problem and its variations / 
[edited by] Gregory Gutin, Abraham P. Punnen. 
 - New York  :  Springer,  c2007. 
 - xviii, 830 p. :  ill. ;  25 cm. 
 - Combinatorial optimization ;  12 .
<br/><br/>Includes bibliographical references (p. 761-806) and index. 
<br/><br/><label>ISBN: </label>0387444599 (softcover : alk. paper) 9780387444598 (softcover : alk. paper) 
<br/><br/><label>LCCN: </label>2006-933131 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Traveling-salesman problem.<br/>Combinatorial optimization.