Hong-Kai Zhao,
Stanley Osher,
Barry Merriman,
and Myungjoo Kang
Computer Vision & Image Understanding 80(3):295–314, Dec 2000
Tech. report 98-7, Univ. of California, Los Angeles, Dept. of Mathematics, 1998
ftp://ftp.math.ucla.edu/pub/camreport/cam98-7.ps.gz
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