A top-down analysis: Determining photovoltaics RandD investments from patent analysis and RandD headcount by Breyer, C, Birkner, C, Meiss, J, Goldschmidt, J, Riede, M

A top-down analysis: Determining photovoltaics R&D; investments from patent analysis and R&D; headcount by Breyer, C, Meiss, J, Birkner, C, Goldschmidt, J, Riede, M