%0 Journal Article %A Che-Kao Fong %A Andrzej Sołtysiak %T Existence of a multiplicative functional and joint spectra %J Studia Mathematica %D 1985 %P 213-220 %V 81 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-81-2-213-220/ %R 10.4064/sm-81-2-213-220 %G en %F 10_4064_sm_81_2_213_220