Godunov, A.I., B.Zh. Kuatov, and D.M. Sushchik. 2015. “Operation Control Procedures of an Air Crew to Operate an Aircraft”. Bulletin of the Karaganda University. Mathematics Series 77 (1):35-40. http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/8.