@inproceedings{DBLP:conf/pricai/DelgrandeS98,
title = {Reasoning with Sets of Preferences in Default Logic},
author = {Delgrande, James P. and Schaub, Torsten},
booktitle = {{PRICAI}},
pages = {134--145},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
volume = {1531},
year = {1998}
}