@article{MZ_1984__188_173555,
     author = {Peng Fan},
     title = {Cartesian and {Polar} {Decompositions} of {Hypernormal} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {485--492},
     publisher = {mathdoc},
     volume = {188},
     year = {1984},
     zbl = {0538.47015},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__188_173555/}
}