6Abe Dunn. Do Low-quality Products Affect High-quality Entry? Multi-product Firms and Nonstop Entry in Airline Markets[J]. International Journal of Industrial Organization, 2007, (10).
7Baumol, William. Contestable Markets: An Uprising in the Theory of Industry Structure [J]. The American Economic Review, 1982,72 (3).
8Clara Ponsati, Jozsef Sakovics. Queues, Not Just Mediocrity: Inefficiency in Decentralized Markets with Vertical Differentiation[J]. International Journal of Industrial Organization, 2008, (26).
9Gary M. Anderson, Dennis Halcoussis, Linda Johnston, M. D., Anton D. Lowenberg. Regulatory Barriers to Entry in the Healthcare Industry: The Case of Alternative Medicine [J]. The Quarterly Review of Economics and Finance, 2000, (40).
10Martin S. Advanced Industrial Economics (Second Edition)[M]. Blackwell Publishing,2001.