H. Werthner, S. Klein:
"Innovation in tourism enabled by ICT";
in: "Innovation and Product Development in Tourism", B. Walder, K. Weiermair, A. Sancho-Perez (ed.); Erich Schmidt Verlag, Berlin, 2006, ISBN: 3503090797.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06586832