@article{10_4153_CMB_1969_068_2,
     author = {Singh, S.P. and Russell, W.},
     title = {A {Note} on a {Sequence} of {Contraction} {Mappings}},
     journal = {Canadian mathematical bulletin},
     pages = {513--516},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.4153/CMB-1969-068-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-068-2/}
}