@article{10_4064_sm195_1_5,
     author = {Li Chen},
     title = {On unitary equivalence of quasi-free {Hilbert} modules},
     journal = {Studia Mathematica},
     pages = {87--98},
     publisher = {mathdoc},
     volume = {195},
     number = {1},
     year = {2009},
     doi = {10.4064/sm195-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm195-1-5/}
}