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Cleantech Group. (October 31, 2016). Number of clean energy patent grants worldwide in 2015, by select country [Graph]. In Statista. Retrieved January 22, 2021, from https://www.statista.com/statistics/726648/clean-energy-patent-ownership-worldwide-by-country/
Cleantech Group. "Number of clean energy patent grants worldwide in 2015, by select country." Chart. October 31, 2016. Statista. Accessed January 22, 2021. https://www.statista.com/statistics/726648/clean-energy-patent-ownership-worldwide-by-country/
Cleantech Group. (2016). Number of clean energy patent grants worldwide in 2015, by select country. Statista. Statista Inc.. Accessed: January 22, 2021. https://www.statista.com/statistics/726648/clean-energy-patent-ownership-worldwide-by-country/
Cleantech Group. "Number of Clean Energy Patent Grants Worldwide in 2015, by Select Country." Statista, Statista Inc., 31 Oct 2016, https://www.statista.com/statistics/726648/clean-energy-patent-ownership-worldwide-by-country/
Cleantech Group, Number of clean energy patent grants worldwide in 2015, by select country Statista, https://www.statista.com/statistics/726648/clean-energy-patent-ownership-worldwide-by-country/ (last visited January 22, 2021)
