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"A semi-parametric modeling of firms' R&D expenditures with zero values."
Seung-Hoon Yoo, Hye-Seon Moon (2006)
- Seung-Hoon Yoo, Hye-Seon Moon:
A semi-parametric modeling of firms' R&D expenditures with zero values. Scientometrics 69(1): 57-67 (2006)
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