@ARTICLE{Vollmer-NC-2014,
  author = {Vollmer, {\relax Ch}ristian and Hellbach, Sven and Eggert, Julian
    P. and Gross, Horst-Michael},
  title = {Sparse Coding of Human Motion Trajectories with Non-Negative Matrix
    Factorization},
  journal = {Neurocomputing (NC)},
  year = {2014},
  volume = {124},
  pages = {22--32}
}