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Diehl. (June 1, 2018). Expenditure on research and development (R&D) by Diehl from 2011 to 2017 (in million euros) [Graph]. In Statista. Retrieved March 05, 2021, from https://www.statista.com/statistics/712299/diehl-r-and-d-expenditure/
Diehl. "Expenditure on research and development (R&D) by Diehl from 2011 to 2017 (in million euros)." Chart. June 1, 2018. Statista. Accessed March 05, 2021. https://www.statista.com/statistics/712299/diehl-r-and-d-expenditure/
Diehl. (2018). Expenditure on research and development (R&D) by Diehl from 2011 to 2017 (in million euros). Statista. Statista Inc.. Accessed: March 05, 2021. https://www.statista.com/statistics/712299/diehl-r-and-d-expenditure/
Diehl. "Expenditure on Research and Development (R&d) by Diehl from 2011 to 2017 (in Million Euros)." Statista, Statista Inc., 1 Jun 2018, https://www.statista.com/statistics/712299/diehl-r-and-d-expenditure/
Diehl, Expenditure on research and development (R&D) by Diehl from 2011 to 2017 (in million euros) Statista, https://www.statista.com/statistics/712299/diehl-r-and-d-expenditure/ (last visited March 05, 2021)
