1. Contracts as a barrier to entry;P Aghion;American Economic Review,1987
2. The changing contours of the per se rule;P Areeda;Antitrust Law Journal,1985
3. Vertical Restraints: Schwinn Overruled;R H Bork;Supreme Court Review,1977
4. The Nature of the Firm;R H Coase;Economica,1937