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@article{PORMA_1971__30_1_115133, author = {Larsen, R.}, title = {A theorem concerning {Ditkin's} condition}, journal = {Portugaliae mathematica}, pages = {17--20}, publisher = {mathdoc}, volume = {30}, number = {1}, year = {1971}, mrnumber = {0301511}, zbl = {0229.46053}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115133/} }
Larsen, R. A theorem concerning Ditkin's condition. Portugaliae mathematica, Tome 30 (1971) no. 1, pp. 17-20. http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115133/