@article{PORMA_1964__23_2_114921,
     author = {Hammer, Preston C.},
     title = {Extended topology: continuity - {I}},
     journal = {Portugaliae mathematica},
     pages = {77--93},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1964},
     mrnumber = {0210058},
     zbl = {0151.29302},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1964__23_2_114921/}
}