@article{2674, author = {West, Robert W.}, title = {Exact sequences of spaces - II}, journal = {Portugaliae mathematica}, volume = {31}, year = {1972}, pages = {77-84}, zbl = {0237.55008}, mrnumber = {0309107}, language = {en}, url = {http://dml.mathdoc.fr/item/2674} }
West, Robert W. Exact sequences of spaces - II. Portugaliae mathematica, Tome 31 (1972) pp. 77-84. http://gdmltest.u-ga.fr/item/2674/