Michael R. Garey/ David S. Johnson,
COMPUTERS AND INTRACTABILITY - A Guide to the Theory of NP-Completeness,
W.H. Freeman and Company, San Francisco (1979).
Cormen, Thomas H.; Leiserson, Charles E.; Rivest, Ronald L.,
Introduction to Algorithms,
MIT Press,
Cambridge, MA; McGraw-Hill Book Co., New York (1990)
ISBN 0-262-03141-8
created: 23 aprile 2012 updated: 22 settembre 2017