Bokati, L., Kalashnikov, V., Kalashnykova, N., Kosheleva, O. и Kreinovich, V. (2019) «How to Assign Grades to Tasks so as to Maximize Student Efforts», Электронные библиотеки. Kazan, 22(6), сс. 773-779. doi: 10.26907/1562-5419-2019-22-6-773-779.