Ubar, Raimund, Artur Jutman, Margus Kruus, Elmet Orasson, Sergej Devadze, and Heinz-Dietrich Wuttke. “Learning Digital Test and Diagnostics via Internet”. International Journal of Online and Biomedical Engineering (iJOE) 3, no. 1 (February 12, 2007). Accessed June 30, 2024. https://online-journals.org/index.php/i-joe/article/view/361.