Completely Simple Semigroups.
Relations on the Congruence Lattice.
Varieties of Completely Simple Semigroups.
Malcev Product and Homomorphisms.
"A large portion of this book is devoted to such special classes of completely regular semigroups: completely simple semigroups, normal cryptogroups an regular othogroups the lattice of congruences of a completely regular semigroup..." (Zentralblatt MATH, Vol. 967, 2001/17)