The free completely regular semigroup on a set

[1]  M. Petrich.  Certain Varieties and Quasivarieties of Completely Regular Semigroups , 1977, Canadian Journal of Mathematics.

[2]  Mario Petrich,et al.  Introduction to semigroups , 1973 .

[3]  Free inverse semigroups are not finitely presentable , 1975 .

[4]  H. E. Scheiblich.  Free inverse semigroups , 1972 .

[5]  J. Green,et al.  On semi-groups in which xr = x , 1952, Mathematical Proceedings of the Cambridge Philosophical Society.

[6]  J. Howie.  An introduction to semigroup theory , 1976 .

[7]  George Gratzer,et al.  Universal Algebra , 1979 .

[8]  Alfred Horn,et al.  The category of semilattices , 1971 .