@article{10_4153_CMB_1975_134_x,
     author = {Roberts, James W.},
     title = {Pointwise {Finite} {Families} of {Mappings}},
     journal = {Canadian mathematical bulletin},
     pages = {767--768},
     year = {1975},
     volume = {18},
     number = {5},
     doi = {10.4153/CMB-1975-134-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-134-x/}
}