@article{MZ_1993__212_4_174476,
     author = {P.J. de Paepe},
     title = {Approximation on a disk {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {145--152},
     publisher = {mathdoc},
     volume = {212},
     number = {4},
     year = {1993},
     zbl = {0789.30027},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__212_4_174476/}
}