1. History of the International Chemical Industry;Aftalion,1959
2. The chemical industry: evolution of industry structure;Arora,1998
3. 20 Years of Pharmaceutical Research Results Throughout the World;Barral,1996
4. Does firm size matter?;Boeri;Giornale degli Economisti e Annali di Economia,1989
5. Bottazzi, G., Dosi, G., Lippi, M., Pammolli, L., Riccaboni, M., 2000. Processes of corporate growth in the evolution of an innovation-driven industry. The case of pharmaceuticals. LEM Working Paper, Sant’Anna School of Advanced Studies, Pisa.