@article{3185,
author = {Grzaslewicz, Ryszard},
title = {Extreme positive contractions on the Hilbert space},
journal = {Portugaliae mathematica},
volume = {46},
year = {1989},
pages = {341-349},
zbl = {0694.47029},
mrnumber = {1032505},
language = {en},
url = {http://dml.mathdoc.fr/item/3185}
}
Grzaslewicz, Ryszard. Extreme positive contractions on the Hilbert space. Portugaliae mathematica, Tome 46 (1989) pp. 341-349. http://gdmltest.u-ga.fr/item/3185/