@article{TMF_1984_60_3_a0,
     author = {A. V. Voronin and V. N. Sushko and S. S. Horuzhy},
     title = {Algebras of unbounded operators and vacuum superselection rules in quantum field theory {II.} {Mathematical} structure of vacuum superselection rules},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {323--343},
     publisher = {mathdoc},
     volume = {60},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_60_3_a0/}
}