1. Analysis on Semigroups: Function Spaces, Compactifications, Representations, vol. 10;Berglund,1989
2. Amenable semigroups;Day;Illinois J. Math.,1957
3. Lumpy subsets in left-amenable locally compact semigroups;Day;Pacific J. Math.,1976
4. Left thick to left lumpy: a guided tour;Day;Pacific J. Math.,1982
5. Abstract Harmonic Analysis: Volume I. Structure of Topological Groups Integration Theory Group Representations;Hewitt,1994