Harmeling, S., Ziehe, A., Kawanabe, M., & Müller, K.-R. (2002). Kernel feature
spaces and nonlinear blind source separation. In T. Dietterich, S. Becker, & Z. Ghahramani (Eds.),
Advances in Neural Information Processing Systems 14 (pp. 761-768). Cambridge, MA, USA:
MIT Press.