@inproceedings{crv07,
author = {R. Caballero, M. Rodr\'{\i}guez Artalejo, R. del Vado V\'{\i}rseda},
title = {Declarative Debugging of Missing Answers in Constraint Functional-Logic Programming},
booktitle = {23rd International Conference on Logic Programming (ICLP 2007)},
year = {2007},
month = {September},
publisher = {Springer-Verlag},
series = {LNCS},
note = {To appear}
}