1Bresnahan, Timothy F., Erik Brynjolfsson and Lorin M. Hitt. Information Technology, Workplace Organization, and the Demand for Skilled Labor: Finn-Level Evidence [J]. Quarterly Journal of Economics, Feb., Vol. 117, 339- 376, 2002.
2Goldin, C. and L. F. Katz. The Origins of Technology-skill Complementarily[J]. Quarterly Journal of Economics, 1998, Aug. ,693 - 732.