@article{JMLR:v15:sprekeler14a,
  author  = {Henning Sprekeler and Tiziano Zito and Laurenz Wiskott},
  title   = {An Extension of Slow Feature Analysis for Nonlinear Blind Source Separation},
  journal = {Journal of Machine Learning Research},
  year    = {2014},
  volume  = {15},
  number  = {26},
  pages   = {921--947},
  url     = {http://jmlr.org/papers/v15/sprekeler14a.html}
}