TY - JOUR AU - S. V. Dvoryaninov TI - It's useful to solve differential equations JO - Matematičeskoe obrazovanie PY - 2018 SP - 7 EP - 11 VL - 87 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MO_2018_87_3_a1/ LA - ru ID - MO_2018_87_3_a1 ER -