1Georg Licht and Dietmarmoch. innovation and infomation technology in services [ J ]. Canadian Journal of Economics Revue Canadienne d' Economique, 1999 ( 2 ) :363 - 383.
2Caroline Freud and Diana Weinhold. The Internet and International Trade in Services [ J ]. American Economic Review, 2002 (92) : 236 -240.
3Jack E. Triplerr and Barry P. Bosworth. Productivity Measurement Issues in Services Industries: "Baumol' s Disease" Has Been Cured [ J ]. FRBNY Economic Policy Review , 2003(9) :23 -33.
4Bart van Ark, Robert Inklaar and Robert H. McGuckin. The contribution of ICT - Producing and ICT - Using Industries to Productivity Growth : A Comparison of Canada, Europe and the United States [ J ]. INTERNATIONAL PRODUCTIVITY MONITOR, 2003 (6) :56 -63.