Shcherbyna, Oleksandr A. “LEARNING TOOLS INTEROPERABILITY – A NEW STANDARD FOR INTEGRATION OF DISTANCE LEARNING PLATFORMS”. Information Technologies and Learning Tools 47, no. 3 (June 6, 2015): 167–177. Accessed May 8, 2024. https://journal.iitta.gov.ua/index.php/itlt/article/view/1246.