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@article{PORMA_1981__40_3_115455, author = {Thomas, Gary M.}, title = {Jointly prescalar sets in {Banach} algebras}, journal = {Portugaliae mathematica}, pages = {305--310}, publisher = {mathdoc}, volume = {40}, number = {3}, year = {1981}, mrnumber = {0819895}, zbl = {0578.46042}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115455/} }
Thomas, Gary M. Jointly prescalar sets in Banach algebras. Portugaliae mathematica, Tome 40 (1981) no. 3, pp. 305-310. http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115455/