@article{MZ_1991__208_3_174322,
     author = {Martin Mathieu and Pere Ara},
     title = {A local version of the {Dauns-Hofmann} theorem.},
     journal = {Mathematische Zeitschrift},
     pages = {349--354},
     publisher = {mathdoc},
     volume = {208},
     number = {3},
     year = {1991},
     zbl = {0726.46042},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__208_3_174322/}
}