Cixun Zhang Kemal Ugur Jani Lainema Moncef Gabbouj Video Coding Using Spatially Varying Transform. 796-806 2009 PSIVT http://dx.doi.org/10.1007/978-3-540-92957-4_69 conf/psivt/2009 db/conf/psivt/psivt2009.html#ZhangULG09