@inproceedings{GrabmuellerHofstedt2011, author = {Martin Grabm{\"u}ller and Petra Hofstedt}, title = {Turtle. A Constraint Imperative Programming Language}, booktitle = {Research and development in intelligent systems XX, proceedings of AI2003, the Twenty-third SGAI International Conference on Innovative Techniques and Applications of Artificial Intelligence}, pages = {185 -- 198}, year = {2011}, }