@article{MAN_1959__139_160742,
     author = {H.L. ROYDEN},
     title = {The {Analytic} {Approximation} of {Differentiable} {Mappings.}},
     journal = {Mathematische Annalen},
     pages = {171--179},
     publisher = {mathdoc},
     volume = {139},
     year = {1959},
     zbl = {0091.37003},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__139_160742/}
}