Geodesic
Theory of reduced density matrices
Teoretičeskaâ i matematičeskaâ fizika, Tome 24 (1975) no. 3, pp. 406-411

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Applications of the expansion of the symmetric group $S_N$ on the left cosets of the subgroup $S_n\times S_m$ $(n+m=N)$ to the reduced density matrices theory are considered. 
@article{TMF_1975_24_3_a11,
     author = {E. S. Kryachko},
     title = {Theory of reduced density matrices},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {406--411},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_24_3_a11/}
}
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E. S. Kryachko. Theory of reduced density matrices. Teoretičeskaâ i matematičeskaâ fizika, Tome 24 (1975) no. 3, pp. 406-411. http://geodesic.mathdoc.fr/item/TMF_1975_24_3_a11/