@inproceedings{BovaChen14,
 author = {Simone Bova and
Hubie Chen},
 booktitle = {Proc. 17th International Conference on Database Theory (ICDT), Athens,
Greece, March 24-28, 2014.},
 pages = {235--244},
 title = {The Complexity of Width Minimization for Existential Positive Queries},
 year = {2014}
}