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Otto, D., Schr\'f6der, N., Diekmann, D., & Sander, P. C..  (2021).  Trends and Gaps in Empirical Research on Open Educational Resources (OER): A Systematic Mapping of the Literature from 2015 to 2019. Contemporary Educational Technology, 13(4). doi:http://dx.doi.org/10.30935/cedtech/11145\par \par Otto, D.  (2020).  Grosse Erwartungen: Die Rolle von Einstellungen bei der Nutzung und Verbreitung von Open Educational Resources. MedienP\'e4dagogik: Zeitschrift f\'fcr Theorie und Praxis der Medienbildung. doi:10.21240/mpaed/00/2020.02.26.X\par \par Bond, M., Buntins, K., Bedenlier, S., Zawacki-Richter, O., & Kerres, M..  (2020).  Mapping research in student engagement and educational technology in higher education: a systematic evidence map. International Journal of Educational Technology in Higher Education, 17(2). doi:https://doi.org/10.1186/s41239-019-0176-8\par \par }