@inproceedings{stiefel:98a,
   author    = {Rainer Stiefelhagen and Jie Yang and Alex Waibel},
   title     = {Towards Tracking Interaction Between People},
   booktitle = {Intelligent Environments. Papers from the 1998 AAAI Spring Symposium},
   organization = {AAAI},
   pages     = {123-127},
   year      = {1998},
   month     = {March},
   publisher = {AAAI Press},
   address   = {Menlo Park, California 94025},
   series    = {Technical Report SS-98-02}
}