@inproceedings{RR08b,
author ={M.~Rodr\'{\i}guez-Artalejo and C.A.~Romero-D\'{\i}az},
title = {Qualified Logic Programming with Bivalued Predicates},
booktitle = {Proceedings of PROLE'08},
projects = {MERIT,PROMESAS},
butype = {inproceedings},
year = {2008}
}