@Article{PRL:SSA:2009,
  title = {Finding Stationary Subspaces in Multivariate Time Series},
  author = {von B\"unau, Paul  and Meinecke, Frank C. and Kir\'aly, Franz C. and M\"uller, Klaus-Robert},
  journal = {Phys. Rev. Lett.},
  volume = {103},
  number = {21},
  pages = {214101},
  numpages = {4},
  year = {2009},
  month = {Nov},
  doi = {10.1103/PhysRevLett.103.214101},
  publisher = {American Physical Society}
}