@InProceedings{NickelCHIL2009,
  author  = {Kai Nickel and Montse Pardàs and Rainer Stiefelhagen and Cristian Canton Ferrer and José Luis Landabaso and Josep R. Casas},
  title   = {Activity classification},
  booktitle = {Computers in the Human Interaction Loop},
  publisher = {Springer-Verlag},
  year      = {2009}
}