The system of idempotents of a regular semigroup
Groupe d'étude d'algèbre, Tome 1 (1975-1976), Exposé no. 8, 14 p. 
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     title = {The system of idempotents of a regular semigroup},
     journal = {Groupe d'\'etude d'alg\`ebre},
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     publisher = {Secr\'etariat math\'ematique},
     volume = {1},
     year = {1975-1976},
     zbl = {0379.20051},
     language = {en},
     url = {http://archive.numdam.org/item/GEA_1975-1976__1__A8_0/}
}
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Clifford, Alfred H. The system of idempotents of a regular semigroup. Groupe d'étude d'algèbre, Tome 1 (1975-1976), Exposé no. 8, 14 p. http://archive.numdam.org/item/GEA_1975-1976__1__A8_0/

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