@article{PORMA_1968__27_2_115065,
     author = {West, Robert W.},
     title = {Some exact sequences of spaces},
     journal = {Portugaliae mathematica},
     pages = {99--117},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1968},
     mrnumber = {0261603},
     zbl = {0196.26704},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1968__27_2_115065/}
}