@article{MZ_1967__97_170701,
     author = {A.P.J. van der Walt},
     title = {Rings with {Dense} {Quasi-Centre.}},
     journal = {Mathematische Zeitschrift},
     pages = {38--44},
     publisher = {mathdoc},
     volume = {97},
     year = {1967},
     zbl = {0219.16020},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__97_170701/}
}