@article{DE_1997_33_8_a8,
     author = {A. V. Aleksandrov},
     title = {The {Poincar\'e} problem for second-order elliptic systems on a plane in {Hardy-type} classes},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1069--1075},
     publisher = {mathdoc},
     volume = {33},
     number = {8},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_8_a8/}
}