@workingPaper{DoniniLenzeriniNardiNuttSchaerf_1993,
title={Queries, rules and definitions as epistemic statements in concept languages},
author={Donini, Francesco M. and Lenzerini, Maurizio and Nardi, Daniele and Nutt, Werner and Schaerf, Andrea},
doi={http://dx.doi.org/10.22028/D291-24926},
year={1993}
}