@article{MZ_1984__188_173524,
     author = {Burkhard S\"undermann},
     title = {On {Projection} {Constants} of {Polynomial} {Spaces} on the {Unit} {Ball} in {Several} {Variables.}},
     journal = {Mathematische Zeitschrift},
     pages = {111--118},
     publisher = {mathdoc},
     volume = {188},
     year = {1984},
     zbl = {0544.41026},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__188_173524/}
}