@inproceedings{Sti_j2008, author = {Ralf~Stiebe}, title = {On the Complexity of the Control Language in Tree Controlled Grammars}, booktitle = {Colloquium on the Occasion of the 50th Birthday of Victor Mitrana. Proceedings}, year = {2008}, publisher = fin, pages = {29--36}, url = {http://theo.cs.uni-magdeburg.de/pubs/papers/coll_mit-stiebe.pdf} }