TY - JOUR AU - Iliev, Oleg TI - Improving the Productivity of the E-learning Process JO - Serdica Journal of Computing PY - 2020 SP - 113 EP - 144 VL - 14 IS - 3-4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SJC_2020_14_3-4_a2/ LA - en ID - SJC_2020_14_3-4_a2 ER -