@article{10_4153_CMB_1968_075_1,
     author = {Boyd, D.W. and Wong, J. S. W.},
     title = {Another {Proof} of the {Contraction} {Mapping} {Principle}},
     journal = {Canadian mathematical bulletin},
     pages = {605--606},
     year = {1968},
     volume = {11},
     number = {4},
     doi = {10.4153/CMB-1968-075-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-075-1/}
}