1. Horizontal mergers: an equilibrium analysis;Farrell;American Economic Review,1990
2. Oligopoly and the incentive for horizontal merger;Perry;American Economic Review,1985
3. Economies as an antitrust defense: the welfare tradeoffs;Williamson;American Economic Review,1968
4. Horizontal mergers: comment;Werden;American Economic Review,1991
5. A robust test for consumer welfare enhancing mergers among sellers of differentiated products;Werden;Journal of Industrial Economics,1996