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Oil Shale1995 http://www.ester.ee/record=b1072685*est
Oil shale2002 https://www.ester.ee/record=b1072685*est
Oil shale2003
Oil shale2008
Oil shale1997
Oil Shale2001 http://www.ester.ee/record=b1072685*est
Oil shale2019 https://kirj.ee/oilshale/ https://www.ester.ee/record=b1072685*est
Oil shale2020 https://kirj.ee/oilshale/ https://www.ester.ee/record=b1072685*est
Oil shale2021 https://kirj.ee/oilshale/ https://www.ester.ee/record=b1072685*est
Oil shale2022 https://www.ester.ee/record=b1072685*est https://kirj.ee/oilshale/
Oil shale2023 https://www.ester.ee/record=b1072685*est https://kirj.ee/oilshale/
Oil shale2024 https://www.ester.ee/record=b1072685*est https://kirj.ee/oilshale/ https://www.scopus.com/sourceid/17080
Oil shale2025 https://www.ester.ee/record=b1072685*est https://kirj.ee/oilshale/ https://www.scopus.com/sourceid/17080