Connections between left adequate semigroups and γ-semigroups
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[1] J. Fountain,et al. Right PP monoids with central idempotents , 1976 .
[2] John Fountain. A CLASS OF RIGHT PP MONOIDS , 1977 .
[3] Le Produit Demi-Direct Pour les Demi-Groupes Inverses , 1979 .