Sousa, Lorena, Luís Pedro, and Carlos Santos. “A Systematic Review of Systematic Reviews on Open Educational Resources: An Analysis of the Legal and Technical Openness”. The International Review of Research in Open and Distributed Learning 24, no. 3 (September 6, 2023): 18–33. Accessed October 8, 2024. https://www.irrodl.org/index.php/irrodl/article/view/7196.