
 [No title] 
  B. Bordbar and J. Pym, The set of idempotents in the weakly almost periodic compactification of the integers is not closed, Trans. 
  R. Butcher, The StoneCech compactification of a semigroup and its algebra of measures, Ph.D Dissertation (1975), University of Sheffield. 
  A. Maleki and D. Strauss, Homomorphisms, ideals and commutativity in the StoneCech compactification of a discrete semigroup, Topology and its Applications 71 (1996), 4761. 
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