%0 Journal Article %A Claudio Bartolone %A Fabio Di Franco %T A Remark on the Projectivities of the Projective Line over a Commutative Ring. %J Mathematische Zeitschrift %D 1979 %P 23-30 %V 169 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1979__169_172878/ %F MZ_1979__169_172878