Guanghui Yan LiSong Liu LinNa Du XiaXia Yang ZhiCheng Ma Unsupervised Sequential Forward Dimensionality Reduction Based on Fractal. 48-52 2008 FSKD (2) http://dx.doi.org/10.1109/FSKD.2008.235 conf/fskd/2008-2 db/conf/fskd/fskd2008-2.html#YanLDYM08