@article{10_4153_CJM_1984_026_2,
     author = {Giambruno, A.},
     title = {On the {Symmetric} {Hypercenter} of a {Ring}},
     journal = {Canadian journal of mathematics},
     pages = {421--435},
     year = {1984},
     volume = {36},
     number = {3},
     doi = {10.4153/CJM-1984-026-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1984-026-2/}
}