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Mulder, F. R., & Janssen, B. (2013). Opening Up Education. In R. Jacobi, H. Jelgerhuis, & N. van der Woert (Eds.), Trend Report: Open Educational Resources 2013 (pp. 36-42). Utrecht: SURF SIF OER.
http://www.surf.nl/en/knowledge-and-innovation/knowledge-base/2013/trend-report-open-educational-resources-2013.html
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