@article{MZ_1919__5_167548,
     author = {H., Steinhaus},
     title = {Additive und stetige {Funktionaloperationen}},
     journal = {Mathematische Zeitschrift},
     pages = {186--221},
     publisher = {mathdoc},
     volume = {5},
     year = {1919},
     zbl = {47.0384.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__5_167548/}
}