4Pavlou,P. h.,& Dimoka,h. The nature and role of feedback text comments in online market-places: Implications for trust building,price premiums,and seller differentiation. Information Systems Research, 2006,17(4),392-414.
5Tobin J. ,Estimation of relationships for limited dependent vairiable,Econometrica,1958,26 (1): 24-36.
6Girard T.,Silverblatt R.,Korgaonkar P.,influence of product class on preference for shopping on the internet. Journal of Computer Mediated Communications,2002,8 (1). http://jcmc. Indiana. edu/vol8/issuel/glrard.html.
7Livingston,J. "Howvaluable is agoodreputation? A Sample Selection Model of Internet Auctions". Review of Economics and Statistics,2005,87(3):453-465.