@article{10_4153_CMB_1965_049_5,
     author = {Wong, James S. W.},
     title = {Some {Remarks} on {Transformations} in {Metric} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {659--666},
     year = {1965},
     volume = {8},
     number = {5},
     doi = {10.4153/CMB-1965-049-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-049-5/}
}