@inproceedings{AFJV02,
 author = "Mar\'{\i}a Alpuente and Moreno Falaschi and Pascual Juli\'an
           and Germ\'an Vidal",
 title = "Lazy Narrowing and Needed Narrowing: A Comparison",
 booktitle = "Proc.\ of the Int'l Workshop on Functional and (Constraint)
              Logic Programming (WFLP'2002)",
 publisher = "Universit\`a di Udine",
 pages = "21-34",
 year = 2002
}