Besnard, Philippe and
Schwab, Torstein. 1993.
“A Context-Based Framework for Default Logics.” in
AAAI-93. Proceedings of the Eleventh National Conference on Artificial Intelligence, edited by Richard E.
Fikes and Wendy G.
Lehnert, pp. 406–411. Menlo Park, California: The
AAAI Press.