1. Resource and Output Trends in the United States since 1870;Abramovitz;American Economic Review,1956
2. Technical Change and the Aggregate production Function;Solow;Review of Economics and Statistics,1957
3. Secular Movements in Production and Prices;Kuznets,1930
4. Industrial Market Structure and Economic Performance;Scherer,1980
5. Barriers to New Competition;Bain,1956