@article{10_4153_CJM_1966_110_1,
     author = {Wong, James S. W.},
     title = {Generalizations of the {Converse} of the {Contraction} {Mapping} {Principle}},
     journal = {Canadian journal of mathematics},
     pages = {1095--1104},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-110-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-110-1/}
}