@article{10_1017_S2040618500035000,
     author = {Yeung, Yik-Hoi Au},
     title = {Another proof of the theorems on the eigenvalues of a square quaternion matrix},
     journal = {Glasgow mathematical journal},
     pages = {191--195},
     year = {1964},
     volume = {6},
     number = {4},
     doi = {10.1017/S2040618500035000},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500035000/}
}