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Citations: Greenstein, Shane. 1995. Lock-in and the Costs of Switching Mainframe Computer Vendors in the US Federal Government in the 1970s. IEEE Annals of the History of Computing. (3)58-66.

Citations: Greenstein, Shane, James Wade. 1998. The Product Life Cycle in the Commercial Mainframe Computer Market, 1968- 1982. RAND Journal of Economics. (4)772-789.