@article{PORMA_1996__53_1_47488,
     author = {Gong, Ming-Peng},
     title = {On a result of {Williamson.}},
     journal = {Portugaliae mathematica},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {1996},
     zbl = {0845.15013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1996__53_1_47488/}
}