Modification method of spaced repetition sequence based on user's online activity

I.E. Mikhailov, P.V. Balakshin
2019 Naučno-tehničeskij Vestnik Informacionnyh Tehnologij, Mehaniki i Optiki  
doi:10.17586/2226-1494-2019-19-4-689-696 fatcat:xkswhojnbbhx5ou6lo5qy4scum