@article{IM2_2006_70_6_a6,
     author = {A. P. Soldatov},
     title = {Second-order elliptic systems in the half-plane},
     journal = {Izvestiya. Mathematics },
     pages = {1233--1264},
     publisher = {mathdoc},
     volume = {70},
     number = {6},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2006_70_6_a6/}
}