@article{MZ_1963__82_170204,
     author = {Jens Erik Fenstad},
     title = {On ...-groups of uniformly continuous functions. {I.} {Approximation} theory.},
     journal = {Mathematische Zeitschrift},
     pages = {434--444},
     publisher = {mathdoc},
     volume = {82},
     year = {1963},
     zbl = {0119.18002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1963__82_170204/}
}