@inproceedings{OrdyniakSzeider11,
 author = {Sebastian Ordyniak and Stefan Szeider},
 booktitle = {Proceedings of the 22nd International Joint Conference on 
Artificial Intelligence, IJCAI 2011},
 editor = {Toby Walsh},
 pages = {1033-1038},
 publisher = {AAAI Press/IJCAI},
 title = {Augmenting Tractable Fragments of Abstract Argumentation},
 year = {2011}
}