%0 Journal Article %A Kallman, Robert R. %T A Problem of Gelfand on Rings of Operators and Dynamical Systems %J Canadian journal of mathematics %D 1970 %P 514-517 %V 22 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-058-x/ %R 10.4153/CJM-1970-058-x %F 10_4153_CJM_1970_058_x