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Previous Work
Nonparametric Representations
nSplashes (Stein and Medioni, 1992)
nSAI  (Hebert et. al., 1995).
nPoint Signatures (Chua and Jarvis,     1997).
nShape Spectrum (Dorai and Jain, 1997).
nHarmonic Images (Zang, 1999).
nSpin Images (Johnson, 1999).
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