%0 Journal Article %A Preston, G. B. %T The Structure of Normal Inverse Semigroups %J Glasgow mathematical journal %D 1956 %P 1-9 %V 2 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S2040618500033360/ %R 10.1017/S2040618500033360 %F 10_1017_S2040618500033360