5Dewan S, Kraemer K L. IT and productivity evidence from country - level data [ J ]. Management Science, 2000, 46(4) :548 -562.
6Lee S Y T, Gholami R, Tong T Y. Time series analysis in the assessment of ICT impact at the aggregate level - lessons and implications for the new economy[ J]. Information & Management 2005, 42 (7) : 1009 - 1022.
7Hitt L M, Brynjolfsson. Productivity, business profitability and consumer surplus: three different measures of information technology value[J]. MIS Quarterly, 1996, 20(2) :121 - 142.
8Weill P. The relationship between investment in information technology and firm performance: a study of the valve manufacturing sector[ J ]. Information Systems Research, 1992, 3(4) :307 -333.
9Bfynjolfsson E. The productivity paradox of information technology[ J]. Communications of the ACM, 1993, 36 (12) :67 -77.
10Bakos Y. The productivity payoff of computers [ J ]. Science, 1998, 281(5373): 52.
