Junfa Liu Yiqiang Chen Jinjing Xie Xingyu Gao Wen Gao Semi-supervised Learning of Caricature Pattern from Manifold Regularization. 413-424 2009 MMM http://dx.doi.org/10.1007/978-3-540-92892-8_42 conf/mmm/2009 db/conf/mmm/mmm2009.html#LiuCXGG09