TY - JOUR TI - In memory of Alexander V. Karapetyan JO - Russian journal of nonlinear dynamics PY - 2021 SP - 243 EP - 244 VL - 17 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ND_2021_17_2_a7/ LA - en ID - ND_2021_17_2_a7 ER -