O. Kouzmitcheva , C. Martens, A. Pape, H. She, I. Volosyak, A. Gräser: "FRIEND - An Intelligent Assistant in Daily Life"; Advances in Rehabilitation Robotics, Ed.: Bien Z., Stefanov D., Springer Verlag, June 2004, ISBN:3-540-21986-2, 2004, S. 95-126 ; 2004; pdf
