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Effective Patent Life in Pharmaceuticals
(International Journal of Technology Management, 2000)
The Determinants of Pharmaceutical Research and Development Expenditures
(Journal of Evolutionary Economics, 2000)
Innovation and Structural Change in Pharmaceuticals and Biotechnology
(Industrial and Corporate Change, 1994)
A New Look at the Returns and Risks to Pharmaceutical R & D
(Management Science, 1990-07)