4Panzar, John C and Robert D. Willing. Economic of scale in multi-output production [J ]. Quarterly Journal of Economics 1977, (91): 481-493.
5Baumol, William J, John C. Panzar, and robert D. Willing. Contestable Markets and the Theory of Industry Structre[M]. New York: Harcourt Brace Jovanovich 1982. (preface).
6Dunne, Timothy, Mark roberts, and Larry Samuelson.Patterns of firm entry and exit in U. S manufacturing industries [J]. Rand Journal of Economics 1988, (19):495-515.
7Friedlaender, Ann F. Clifford Winston, and Kung Wang.Cost, technology, and Productivity in the U. S. automobile industry [J]. Bell Journal of Economics 1983, (14):1-20.
