Abeywardena IS, Raviraja S, Tham CY. Conceptual framework for parametrically measuring the desirability of open educational resources using D-index. IRRODL [Internet]. 2012 Apr. 13 [cited 2026 Jun. 19];13(2):59-76. Available from: https://www.irrodl.org/index.php/irrodl/article/view/1177