@article{JRAM_1964__213_150597,
     author = {Preston C. Hammer},
     title = {Extended {Topology:} {Structure} of {Isotonic} {Functions.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {174--186},
     publisher = {mathdoc},
     volume = {213},
     year = {1964},
     zbl = {0151.29203},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1964__213_150597/}
}