@inproceedings{DBLP:conf/lpnmr/GebserLL07,
title = {Head-Elementary-Set-Free Logic Programs},
author = {Gebser, Martin and Lee, Joohyung and Lierler, Yuliya},
booktitle = {{LPNMR}},
pages = {149--161},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
volume = {4483},
year = {2007}
}