@Book{CLRS01,
  author = 	 { Thomas H. Cormen and Charles E. Leiserson and Ronald L. Rivest and Clifford Stein },
  title = 	 { Introduction to Algorithms },
  publisher = 	 { MIT Press and McGraw Hill },
  OPTyear = 	 { 2001 },
  date =         { 2001 },                  
  series = 	 { MIT Electrical Engineering and Computer Science },
  edition = 	 { Second edition},
  url =          { http://mitpress.mit.edu/catalog/item/default.asp?tid=8570&ttype=2 },
}