Geodesic
Quasi-free states on~the~$C^*$ algebra of~CCR
Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 1, pp. 3-20

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Primary quasi-free states on the $C^*$ algebra of CCR are investigated. The main result of the paper is a theorem which establishes necessary and sufficient conditions for the quasiequivalence of two such states. 
@article{TMF_1971_6_1_a0,
     author = {A. S. Holevo},
     title = {Quasi-free states on~the~$C^*$ algebra {of~CCR}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {3--20},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_6_1_a0/}
}
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A. S. Holevo. Quasi-free states on~the~$C^*$ algebra of~CCR. Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 1, pp. 3-20. http://geodesic.mathdoc.fr/item/TMF_1971_6_1_a0/