@article{10_4153_CJM_1977_115_2,
     author = {Ellers, Erich W.},
     title = {Bireflectionality in {Classical} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {1157--1162},
     year = {1977},
     volume = {29},
     number = {6},
     doi = {10.4153/CJM-1977-115-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-115-2/}
}