9Brown, Jeffrey R. and Austan Goolsbee, Does Intemet Make Markets more Competitive? Evidence from the Life Insurance Industry.. Journal of Political Economy,2002, pp.481 - 507. 被引量:1
10Bruce, Donald and William F. Fox, E-commerce in the context of declining state sales tax bases. National Tax Journal, Vol.53, No.4,Part 3, 2000, pp. 1373 - 1388. 被引量:1