Laffont, Jean-Jacques and Tirole, Jean (2001) The Regulation of Multiproduct Firm: Part II: Applications to Competitive Environments and Policy Analysis. In: Welfare Economics Baumol, William J. and Wilson, Charles A. (eds.) Edward Elgar. Series “International Library of Critical Writings in Economics”, Vol. III. Chapter Vol lII, part III, 24. pp. 557-586. ISBN 978 1 85278 200 9