@article{ELA_1999__5__a7,
     author = {Tam, Tin-Yau},
     title = {An extension of a result of {Lewis}},
     journal = {The electronic journal of linear algebra},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {5},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_1999__5__a7/}
}