Scott C. Douglas Jan Eriksson Visa Koivunen Equivariant Algorithms for Estimating the Strong-Uncorrelating Transform in Complex Independent Component Analysis. 57-65 2006 conf/ica/2006 ICA http://dx.doi.org/10.1007/11679363_8 db/conf/ica/ica2006.html#DouglasEK06