Zhihua Zhang Guang Dai Michael I. Jordan A Flexible and Efficient Algorithm for Regularized Fisher Discriminant Analysis. 632-647 2009 ECML/PKDD (2) http://dx.doi.org/10.1007/978-3-642-04174-7_41 conf/pkdd/2009-2 db/conf/pkdd/pkdd2009-2.html#ZhangDJ09