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Note that besides Ovjanikov et.al, Heat Kernel Signature was invented indenpendantly (under the name "auto diffusion function") and published as the same conference (SGP) by Gebal et.al, see the following reference: http://dl.acm.org/citation.cfm?id=1735623
12.96.84.3 (talk) 01:04, 24 March 2012 (UTC) Bruno Levy