1. Alexander Henderson's (their colleague at Carnegie) who used a matrix game to describe duopoly behaviour (in his letter Modigliani suggested to Sylos the reading of Henderson' paper);Modigliani was familiar with game theory,1954
2. OLIGOPOLY THEORY, ENTRY-PREVENTION, AND GROWTH
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3. A Note on Pricing in Monopoly and Oligopoly;J S Bain;American Economic Reviw,1949
4. Monopolistic Competition Revisited;E H Chamberlin;Economica,1951