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Lübben, Sonja and Müskens, Wolfgang and Zawacki-Richter, Olaf (2023) Quality of OER: test theoretical development and validation of an assessment tool. In: Distributed learning ecosystems: concepts, resources, and repositories. Springer VS, Wiesbaden, pp. 139-160. ISBN 978-3-658-38702-0 - 978-3-658-38703-7