Staffan Björk Jussi Holopainen Peter Ljungstrand Regan L. Mandryk Editorial: Special Issue on Ubiquitous Games. 358-361 2002 6 Personal and Ubiquitous Computing 5/6 http://link.springer.de/link/service/journals/00779/bibs/2006005/20060358.htm db/journals/puc/puc6.html#BjorkHLM02