%0 Journal Article
%A Paul Georgiou
%T A Semigroup Structure in the Space of Liftings.
%J Mathematische Annalen
%D 1974
%P 195-202
%V 208
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1974__208_162568/
%F MAN_1974__208_162568