@inproceedings{HoellerECAI14,
   title = {Language Classification of Hierarchical Planning Problems},
   author = {Daniel H{\"{o}}ller and Gregor Behnke and Pascal Bercher and Susanne Biundo},
   booktitle = {Proceedings of the 21st European Conference on Artificial Intelligence ({ECAI})},
   publisher = {IOS Press},
   pages = {447-452},
   year = {2014}
}