@article{10_4153_CJM_1978_031_x,
     author = {Montgomery, Susan},
     title = {Invariant {Subgroups} in {Rings} with {Involution}},
     journal = {Canadian journal of mathematics},
     pages = {350--357},
     year = {1978},
     volume = {30},
     number = {2},
     doi = {10.4153/CJM-1978-031-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-031-x/}
}