Schießl, I., Schöner, H., Stetter, M., Dima, A. and Obermayer, K. (2000). Regularized Second Order Source Separation. Int. Workshop on Independent Component Analysis and Blind Signal Separation, 111 – 116.
Schiessl, I., Stetter, M., Mayhew, J., Askew, S., McLoughlin, N., Levitt, J., Lund, J. and Obermayer, K. (1999). Blind Separation of Spatial Signal Patterns from Optical Imaging Records. ICA99 - International workshop on Idependent Component Analysis and Blind Source Separation, 179 – 184.