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2. Regular semigroup congruences;Feigenbaum,1979
3. On inverses of products of idempotents in regular semigroups;Fitz-Gerald;J. Austral. Math. Soc.,1972
4. On regular semigroups;Hall;J. Algebra,1977
5. Some properties of local subsemigroups inherited by larger subsemigroups;Hall,1982