%0 Journal Article %A A. V. Voronin %A V. N. Sushko %A S. S. Horuzhy %T Algebras of unbounded operators and vacuum superselection rules in quantum field theory II. Mathematical structure of vacuum superselection rules %J Teoretičeskaâ i matematičeskaâ fizika %D 1984 %P 323-343 %V 60 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1984_60_3_a0/ %G ru %F TMF_1984_60_3_a0