@article{PORMA_1975__34_2_115255,
     author = {Tamura, Takayuki},
     title = {Semi-closure mappings and cofinal chains},
     journal = {Portugaliae mathematica},
     pages = {111--117},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1975},
     mrnumber = {0387137},
     zbl = {0326.06002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1975__34_2_115255/}
}