1. Dorfman, R., Steiner, P.O. Optimal advertising and optimal quality. American Economic Review, 44, 826–36, 954.
2. Ehrenberg A.S., Repeat Buying, Theory and Applications, Amsterdam-North Holland, 1972.
3. El Ouardighi F. and C.S. Tapiero, Qualité et diffusion des produits, Recherche et Applications en Marketing, 11, no.4, 1996, pp. 35
4. El Ouardighi F. and C.S. Tapiero, Modèles de diffusion en marketing Recherche et Applications en Marketing, December 1997
5. El Ouardighi and C.S. Tapiero, Quality and the Diffusion of Innovations, European Journal of Operations Research, 106, 1998, 31–38