%0 Journal Article %A Yu. Abramov %T On the geometric properties of the joint spectrum of a family of self-adjoint operators %J Studia Mathematica %D 1977 %P 55-62 %V 61 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-61-1-55-62/ %R 10.4064/sm-61-1-55-62 %G en %F 10_4064_sm_61_1_55_62