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@article{PORMA_1957__16_4_114794, author = {Swingle, Paul M.}, title = {Sums of connected sets with indecomposable properties}, journal = {Portugaliae mathematica}, pages = {129--144}, publisher = {mathdoc}, volume = {16}, number = {4}, year = {1957}, mrnumber = {0123289}, zbl = {0086.37002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1957__16_4_114794/} }
Swingle, Paul M. Sums of connected sets with indecomposable properties. Portugaliae mathematica, Tome 16 (1957) no. 4, pp. 129-144. http://geodesic.mathdoc.fr/item/PORMA_1957__16_4_114794/