@article{PORMA_1972__31_2_115164,
     author = {West, Robert W.},
     title = {Exact sequences of spaces - {II}},
     journal = {Portugaliae mathematica},
     pages = {77--84},
     publisher = {mathdoc},
     volume = {31},
     number = {2},
     year = {1972},
     mrnumber = {0309107},
     zbl = {0237.55008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1972__31_2_115164/}
}