Martin Peim Enrico Franconi Norman W. Paton Estimating the quality of answers when querying over description logic ontologies. 105-129 2003 47 Data Knowl. Eng. 1 http://dx.doi.org/10.1016/S0169-023X(03)00067-3 db/journals/dke/dke47.html#PeimFP03