@techreport{FroschHarhoffHoisletal.2015, author = {Frosch, Katharina and Harhoff, Dietmar and Hoisl, Karin and Steinle, Christian and Zwick, Thomas}, title = {Clean Technology Innovations in Germany: Human Capital Accumulation under Heterogeneous Knowledge Inputs}, pages = {34}, year = {2015}, language = {en} }