1. Cohen, W., Levin, R. (1989). — “Innovation and Market Structure”. In R. Schmalensee and R. Willing eds., Handbook of Industrial Organization, vol. 2, ch. 18, pp. 1060–1107.
2. Crepon, B., Duguet, E. (1995). — “Une bibliotheque de macro commandes pour reconometrie des donnees de comptage et des variables qualitatives”. CREST working paper 9525.
3. Dasgupta, P. (1986). — “The Theory of Technological Competition”. In J. Stiglitz and F. Mathewson eds., New Developments in the Analysis of Market Structure. The MIT Press
4. Francois, J.-P. (1991). — “Une enquete sur l’innovation”. Courrier des Statistiques, n° 57.
5. Griliches, Z. (1986). — “Productivity, R&D and Basic Research at the Firm Level in the 1970’s”, American Economic Review, vol. 76, n° l, pp. 141–154.