@article{MAN_1976__220_162817,
     author = {Rainer Danckwerts and Silke G\"obel and Konrad Meyfarth},
     title = {\"Uber die {Cunningham-oo-Algebra} und den {Zentralisator} reeller {Banachr\"aume.}},
     journal = {Mathematische Annalen},
     pages = {163--170},
     publisher = {mathdoc},
     volume = {220},
     year = {1976},
     zbl = {0306.46080},
     url = {http://geodesic.mathdoc.fr/item/MAN_1976__220_162817/}
}