@article{MM2_1984__48_155029,
     author = {Theodor Br\"ocker},
     title = {Universelle {Familien} differenzierbarer {Funktionen} auf der {Kreislinie.}},
     journal = {Manuscripta mathematica},
     pages = {275--290},
     publisher = {mathdoc},
     volume = {48},
     year = {1984},
     zbl = {0554.58015},
     url = {http://geodesic.mathdoc.fr/item/MM2_1984__48_155029/}
}