@article{10_4153_CJM_1978_014_9,
     author = {Greenfield, Gary R.},
     title = {A {Note} on {Subnormal} {Subgroups} of {Division} {Algebras}},
     journal = {Canadian journal of mathematics},
     pages = {161--163},
     year = {1978},
     volume = {30},
     number = {1},
     doi = {10.4153/CJM-1978-014-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-014-9/}
}