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@article{PORMA_1987__44_2_115574, author = {Joyner, David}, title = {Summation operators and}, journal = {Portugaliae mathematica}, pages = {119--130}, publisher = {mathdoc}, volume = {44}, number = {2}, year = {1987}, mrnumber = {0911435}, zbl = {0631.10031}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1987__44_2_115574/} }
Joyner, David. Summation operators and. Portugaliae mathematica, Tome 44 (1987) no. 2, pp. 119-130. http://geodesic.mathdoc.fr/item/PORMA_1987__44_2_115574/