On Shapes

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\begin{bibtex} @inproceedings{DBLP:conf/ijcai/BallardS81, title={On Shapes}, pages={607-612}, year={1981}, crossref={DBLP:conf/ijcai/1981}, booktitle={IJCAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/ijcai/ijcai81.html#BallardS81}, author={Dana H. Ballard and Daniel Sabbah} }\end{bibtex}