Book (DLHandbook)
Baader, F.; Calvanese, D.; McGuinness, D.; Nardi, D. & Patel-Schneider, P.
The Description Logic Handbook
Cambridge University Press, 2003

Article (KL-ONE)
Brachman, R. J. & Schmolze, J. G.
An Overview of the KL-ONE Knowledge Representation System
Cognitive Science, 1985, 9, 171-216

Article (Lutz02)
Lutz, C.
Description Logics with Concrete Domains -- A Survey
Advances in Modal Logic, World Scientific Publishing Co. Pte. Ltd., 2002, 4