Are open educational resources (OER) and practices (OEP) effective in improving learning achievement? A meta-analysis and research synthesis by Ahmed Tlili, Juan Garzón, Soheil Salha, Ronghuai Huang, Lin Xu, Daniel Burgos, Mouna Denden, Orna Farrell, Robert Farrow, Aras Bozkurt, Tel Amiel, Rory McGreal, Aída López-Serrano, David Wiley

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