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@article{10_4064_fm_41_1_38_41, author = {V. Balachandran}, title = {A characterization of {\ensuremath{\Sigma}\ensuremath{\Delta}-rings} of subsets}, journal = {Fundamenta Mathematicae}, pages = {38--41}, publisher = {mathdoc}, volume = {41}, number = {1}, year = {1955}, doi = {10.4064/fm-41-1-38-41}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-41-1-38-41/} }
V. Balachandran. A characterization of ΣΔ-rings of subsets. Fundamenta Mathematicae, Tome 41 (1955) no. 1, pp. 38-41. doi : 10.4064/fm-41-1-38-41. http://geodesic.mathdoc.fr/articles/10.4064/fm-41-1-38-41/
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