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@article{PORMA_1983__42_4_115556, author = {Artikis, Theodore}, title = {An operator for characteristic functions}, journal = {Portugaliae mathematica}, pages = {409--416}, publisher = {mathdoc}, volume = {42}, number = {4}, year = {1983}, mrnumber = {0836119}, zbl = {0583.60018}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1983__42_4_115556/} }
Artikis, Theodore. An operator for characteristic functions. Portugaliae mathematica, Tome 42 (1983) no. 4, pp. 409-416. http://geodesic.mathdoc.fr/item/PORMA_1983__42_4_115556/