@article{MZ_1959__71_169820,
     author = {Friedhelm Erwe},
     title = {Absch\"atzungen f\"ur beschr\"ankte {Funktionensysteme.}},
     journal = {Mathematische Zeitschrift},
     pages = {414--426},
     publisher = {mathdoc},
     volume = {71},
     year = {1959},
     zbl = {0088.05502},
     url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169820/}
}