@article{10_4064_cm_55_2_219_228,
     author = {S. L. Singh and J. H. M. Whitfield},
     title = {Contractors and fixed points},
     journal = {Colloquium Mathematicum},
     pages = {219--228},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {1987},
     doi = {10.4064/cm-55-2-219-228},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-55-2-219-228/}
}