Reference:
  Author: Maxime Crochemore and Gad M. Landau and Michal Ziv-Ukelson
  Title: A sub-quadratic sequence alignment algorithm for unrestricted cost matrices
  Booktitle: "SODA'02"
  Year: 2002
  Pages: 679-688
  URL: http://arnetminer.org/publication/a-sub-quadratic-sequence-alignment-algorithm-for-unrestricted-cost-matrices-610321.html
