%0 Journal Article %A W. Mlak %T Partitions of spectral sets %J Annales Polonici Mathematici %D 1971 %P 273-280 %V 25 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-25-3-273-280/ %R 10.4064/ap-25-3-273-280 %G fr %F 10_4064_ap_25_3_273_280