@inproceedings{DBLP:conf/iclp/AntoniouBM98,
author = {Grigoris Antoniou and
David Billington and
Michael J. Maher},
title = {Normal Forms for Defeasible Logic},
booktitle = {IJCSLP},
year = {1998},
pages = {160-174},
bibsource = {DBLP, http://dblp.uni-trier.de}
}