Yannick Deville Johanna Chappuis Shahram Hosseini Johan Thomas Differential Fast Fixed-Point BSS for Underdetermined Linear Instantaneous Mixtures. 48-56 2006 conf/ica/2006 ICA https://doi.org/10.1007/11679363_7 db/conf/ica/ica2006.html#DevilleCHT06