Hideto Kazawa Tomonori Izumitani Hirotoshi Taira Eisaku Maeda Maximal Margin Labeling for Multi-Topic Text Categorization. 2004 conf/nips/2004 NIPS http://books.nips.cc/papers/files/nips17/NIPS2004_0238.pdf db/conf/nips/nips2004.html#KazawaITM04