@inproceedings{AEL-IDL99,
    Author = "M.~Alpuente and S.~Escobar and S.~Lucas",
    Title = "{I}ncremental {N}eeded {N}arrowing",
    Editor = "P. Tarau and K. Sagonas",
    Booktitle = "Proc of the Int'l Workshop on Implementation of 
	             Declarative Languages, IDL'99",
    Year = "1999",
}