@article{700977,
     title = {A problem concerning locally-$A$ functions in a commutative Banach algebra $A$
               },
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1962},
     pages = {75-78},
     mrnumber = {MR0150612},
     zbl = {0111.12102},
     url = {http://dml.mathdoc.fr/item/700977}
}

Arens, R. A problem concerning locally-$A$ functions in a commutative Banach algebra $A$
               , dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1962), pp. 75-78. http://gdmltest.u-ga.fr/item/700977/