%0 Journal Article %A Easdown, David %A Gould, Victoria %T Orders in power semigroups %J Glasgow mathematical journal %D 1996 %P 39-47 %V 38 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031232/ %R 10.1017/S0017089500031232 %F 10_1017_S0017089500031232