Michel, Oliver, and Damian Läge. “The Hofmethode: Computing Semantic Similarities Between E-Learning Products”. International Journal of Emerging Technologies in Learning (iJET) 4, no. s3 (November 12, 2009): pp. 36–39. Accessed April 30, 2026. https://online-journals.org/index.php/i-jet/article/view/1102.