@article{PA_1997_4_a11,
     author = {Z. J. Jakubowski and A. {\L}azi\'nska},
     title = {On a class of mappings garmonic in the half-plane},
     journal = {Problemy analiza},
     pages = {139--154},
     publisher = {mathdoc},
     number = {4},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_1997_4_a11/}
}