@inproceedings{DBLP:conf/fapr/SchaubT96, title = {Skeptical Query-Answering in Constrained Default Logic}, author = {Schaub, Torsten and Thielscher, Michael}, booktitle = {{FAPR}}, pages = {567--581}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, volume = {1085}, year = {1996} }