1. Theoretical Connections between Rapid Technological Change and the Development of Market Structure
2. Optimal Timing of Innovations;Y Barzel;Review of Economics and Statistics,1968
3. Sales, Promotion, and Product Differentiation in Two Prescription Drug Markets;Ronald Bond;Federal Trade Commission Staff Report,1977
4. Marketing Costs in Consumer Goods Industries;R D Buzzell;Strategy + Structure = Performance,1977