Geometric Hashing
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L. Holm and C. Sander. 3-d lookup: Fast protein structure database searches at 90 % reliability. Proceedings of the Third International Conference on Intelligent Systems for Molecular Biology 179-187.
V. Alesker, R. Nussinov and H.J. Wolfson. Detection of non-topological motifs in protein structures. Protein Eng., 9:1103-1119, 1996.
H.J. Wolfson. Geometric hashing: An overview. IEEE comp. Science and Eng., 1997.