In: Personal and Ubiquitous Computing, Vol. 7, No. 5, Pages 263-274, Springer-Verlag, London, UK, 2003.
Paul Lukowicz; Jürgen Jahns; Roberto Barbieri Carrera; Philippe Benabes; Thomas Bierhoff; A. Gauthier; Manfred Jarczynski; Gordon A. Russell; Jürgen Schrage; Walter Süllau; John F. Snowdon; Marko Wirz; Gerhard Tröster