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@article{10_4064_fm_77_3_271_275, author = {R. Heath and Richard Hodel}, title = {Characterizations of \ensuremath{\sigma}-spaces}, journal = {Fundamenta Mathematicae}, pages = {271--275}, publisher = {mathdoc}, volume = {77}, number = {3}, year = {1972}, doi = {10.4064/fm-77-3-271-275}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-77-3-271-275/} }
R. Heath; Richard Hodel. Characterizations of σ-spaces. Fundamenta Mathematicae, Tome 77 (1972) no. 3, pp. 271-275. doi : 10.4064/fm-77-3-271-275. http://geodesic.mathdoc.fr/articles/10.4064/fm-77-3-271-275/
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