@article{PORMA_1967__26_4_115053,
     author = {Worrell, J.M. jr.},
     title = {Upper semicontinuous decompositions of spaces having bases of countable order},
     journal = {Portugaliae mathematica},
     pages = {493--504},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1967},
     mrnumber = {0257977},
     zbl = {0189.53303},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_4_115053/}
}