Seiichi Ozawa Kazuya Matsumoto Shaoning Pang Nikola Kasabov Incremental Principal Component Analysis Based on Adaptive Accumulation Ratio. 1196-1203 2008 ICONIP (1) http://dx.doi.org/10.1007/978-3-642-02490-0_145 conf/iconip/2009-1 db/conf/iconip/iconip2009-1.html#OzawaMPK08