Two Results Concerning Ambiguity in Shape From Shading
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\begin{bibtex} @inproceedings{DBLP:conf/aaai/Brooks83, title={Two Results Concerning Ambiguity in Shape From Shading}, pages={36-39}, year={1983}, booktitle={AAAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/aaai/aaai83.html#Brooks83}, author={Michael J. Brooks} }\end{bibtex}
