%0 Journal Article %A Kleinfeld, Erwin %A Kleinfeld, Margaret Humm %T Rings of type $(\gamma ,\delta )$ without zero divisors are associative %J Portugaliae mathematica %D 1977 %P 65-77 %V 36 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115304/ %G en %F PORMA_1977__36_1_115304