1. Baumol, W. 1983. Some subtle pricing issues in railroad regulation. International Journal of Transport Economics. 10, 341--355.
2. Cournot, A. 1838. Researches into the Mathematical Principles of the Theory of Wealth, English edition of Researches sur les principes mathématiques de la théorie des richesses. New York: Kelley.
3. Hecking, H. and Panke, T. 2014. Quantity-setting oligopolies in complementary input markets-the case of iron ore and coking coal. Technical report, Energiewirtschaftliches Institut an der Universitaet zu Koeln.
4. Katz, M. J. and Shapiro, C. 1994. System competition and network effect. Journal of Economic Perspectives. 8, 93--115.
5. Larson, A. C. and Lehman, D. E. 1997. Essentiality, efficiency, and the efficient component-pricing rule. Journal of Regulatory Economics. 12, 71--80.