@article{PORMA_1993__50_3_115690,
     author = {Kleinfeld, Erwin},
     title = {On rings with alternators in the commutative center},
     journal = {Portugaliae mathematica},
     pages = {297--304},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1993},
     mrnumber = {1244508},
     zbl = {0799.17001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_3_115690/}
}