no. 3
Extremal quantum states in coupled systems
Annales de l'I.H.P. Probabilités et statistiques, Tome 41 (2005) no. 3, pp. 257-268 
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     title = {Extremal quantum states in coupled systems},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {257--268},
     year = {2005},
     publisher = {Elsevier},
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     zbl = {1074.81045},
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Parthasarathy, K. R. Extremal quantum states in coupled systems. Annales de l'I.H.P. Probabilités et statistiques, Tome 41 (2005) no. 3, pp. 257-268. doi: 10.1016/j.anihpb.2003.10.009

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