Arthur,W / 1989 / Competing Technologies,Increasing Returns and Lock-in by Historical Evenets / Economic Journal 99:116~131 Altinkemer, K / 2008 / Diffusion Models for the Digital Wireless Industry in the U.S. and the World / Journal of Organizational Computing and Electronic Commerce 18:131~149 Blackman,A / 1974 / The market of technological substitutions / Technological Forecasting and Social Changes 6:41~63 Böhm, V / 1987 / Demand theory / The New Palgrave: A Dictionary of Economics 1:785~792 Brynjolfsson, E / 1996 / Network externalities in microcomputer software:An econometric analysis of the spreadsheet market / Management Science 42(12):1627~1647