Єнчев, С. В. “A Direct Method of Estimation of Quality in the Tasks of Estimation of the Technical State of the Automatic Control of Avia-Engine”. Problems of Informatization and Management 2, no. 20 (October 19, 2007): 67–72. Accessed April 25, 2026. http://jrnl.kai.edu.ua/index.php/PIU/article/view/9087.