Wangmeng Zuo Lei Liu Kuanquan Wang David Zhang Spatially Smooth Subspace Face Recognition Using LOG and DOG Penalties. 439-448 2009 ISNN (3) http://dx.doi.org/10.1007/978-3-642-01513-7_48 conf/isnn/2009-3 db/conf/isnn/isnn2009-3.html#ZuoLWZ09