TY  - JOUR
A1  - Gebser, Martin
A1  - Lee, Joohyung
A1  - Lierler, Yuliya
T1  - Head-elementary-set-free logic programs
Y1  - 2007
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/30061
SN  - 978-3-540- 72199-4
ER  -