@article{MAN_1955__129_160432,
     author = {I.M. Singer and J. Wermer},
     title = {Derivations on {Commutative} {Normed} {Algebras.}},
     journal = {Mathematische Annalen},
     pages = {260--264},
     year = {1955},
     volume = {129},
     zbl = {0067.35101},
     url = {http://geodesic.mathdoc.fr/item/MAN_1955__129_160432/}
}