Michal Natora Felix Franke Matthias Munk Klaus Obermayer Blind Source Separation of Sparse Overcomplete Mixtures and Application to Neural Recordings. 459-466 2009 ICA http://dx.doi.org/10.1007/978-3-642-00599-2_58 conf/ida/2009 db/conf/ida/ida2009.html#NatoraFMO09