TY - JOUR AU - A. V. Aleksandrov TI - The Poincar\'e problem for second-order elliptic systems on a plane in Hardy-type classes JO - Differencialʹnye uravneniâ PY - 1997 SP - 1069 EP - 1075 VL - 33 IS - 8 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1997_33_8_a8/ LA - ru ID - DE_1997_33_8_a8 ER -