Прохоренко, І.В. and Гуз, Ю.Т. 2010. Formalisation of problems of academic activity with control and forgetting the teaching information. Eastern-European Journal of Enterprise Technologies. 3, 6(45) (May 2010), 54–56. DOI:https://doi.org/10.15587/1729-4061.2010.2850.