Geodesic
Extreme positive contractions on the Hilbert space
Portugaliae mathematica, Tome 46 (1989) no. 4, pp. 341-349.

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Keywords: set of extreme points of the positive part of the unit ball of, projections for complex Hilbert space, real Hilbert space, exposed positive operators 
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     author = {Grzaslewicz, Ryszard},
     title = {Extreme positive contractions on the {Hilbert} space},
     journal = {Portugaliae mathematica},
     pages = {341--349},
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     number = {4},
     year = {1989},
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     zbl = {0694.47029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_4_115675/}
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Grzaslewicz, Ryszard. Extreme positive contractions on the Hilbert space. Portugaliae mathematica, Tome 46 (1989) no. 4, pp. 341-349. http://geodesic.mathdoc.fr/item/PORMA_1989__46_4_115675/