Kravtsov Г.М., and Kravtsov Д.Г. “Knowledge Control Model of Distance Learning System ‘Kherson Virtual University’”. Journal of Information Technologies in Education (ITE), no. 1 (May 8, 2007): 066–071. Accessed November 23, 2024. http://ite.kspu.edu/index.php/ite/article/view/698.