Johnstone, Nick, et al. “Renewable Energy Policies and Technological Innovation: Evidence Based on Patent Counts”. Environmental and Resource Economics, vol. 45, no. 1, 2009, pp. 133-55, https://doi.org/10.1007/s10640-009-9309-1.
Johnstone, N., Haščič, I., & Popp, D. (2009). Renewable Energy Policies and Technological Innovation: Evidence Based on Patent Counts. Environmental and Resource Economics, 45(1), 133-155. https://doi.org/10.1007/s10640-009-9309-1
Johnstone N, Haščič I, Popp D. Renewable Energy Policies and Technological Innovation: Evidence Based on Patent Counts. Environmental and Resource Economics. 2009;45(1):133-55.