@article{10_4153_CMB_1991_058_6,
     author = {Jespers, Eric},
     title = {Special {Principal} {Ideal} {Rings} and {Absolute} {Subretracts}},
     journal = {Canadian mathematical bulletin},
     pages = {364--367},
     year = {1991},
     volume = {34},
     number = {3},
     doi = {10.4153/CMB-1991-058-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-058-6/}
}