@INPROCEEDINGS{Straccia97,
AUTHOR	="Straccia, Umberto",
TITLE	="A Sequent Calculus for Reasoning in Four-Valued Description Logics",
BOOKTITLE	=TABLEAUX-97,
series =       LNAI,
number =       1227,
ADDRESS	="Pont-{\`{a}}-Mousson, France",
YEAR	="1997",
pages = "343--357"
}