Media type: E-Article Title: Environmental efficiency of disaggregated energy R&D expenditures in OECD: a bootstrap DEA approach Contributor: Koçak, Emrah; Kınacı, Harun; Shehzad, Khurram Published: Springer Science and Business Media LLC, 2021 Published in: Environmental Science and Pollution Research, 28 (2021) 15, Seite 19381-19390 Language: English DOI: 10.1007/s11356-020-12132-w ISSN: 0944-1344; 1614-7499 Origination: Footnote: