Björn Svensson Anders Brun Mats T. Andersson Hans Knutsson Estimation of Non-Cartesian Local Structure Tensor Fields. 948-957 2007 conf/scia/2007 SCIA http://dx.doi.org/10.1007/978-3-540-73040-8_96 db/conf/scia/scia2007.html#SvenssonBAK07