%0 Journal Article %A K.D. Jr. Magill %A S. Subbiah %T The partially ordered collection of regular ...-classes of S(X). (Short Communication). %J Aequationes mathematicae %D 1976 %P 509-509 %V 14 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1976__14_136617/ %F AM2_1976__14_136617