@misc{xulin:01wn,
  AUTHOR = {Lin Xu and Berthe Y. Choueiry},
  TITLE = {{A Comparative Study of Arc-Consistency Algoritms}},
  MONTH =  sep,
  YEAR = 2001,
  HOWPUBLISHED = {Working Note of the Constraint Systems Laboratory (UNL)},
  NOTE = {September, 2001}}