@article{10_4064_sm173_1_5,
     author = {Man-Duen Choi and Pei Yuan Wu},
     title = {Finite-rank perturbations of
positive operators and isometries},
     journal = {Studia Mathematica},
     pages = {73--79},
     publisher = {mathdoc},
     volume = {173},
     number = {1},
     year = {2006},
     doi = {10.4064/sm173-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm173-1-5/}
}