no. 2
The orderability of idempotent semigroups
Séminaire Albert Châtelet et Paul Dubreil, Tome 25 (1971-1972) no. 2, Exposé no. J8, 7 p. 
@article{SD_1971-1972__25_2_A8_0,
     author = {Sait\^o, Toru},
     title = {The orderability of idempotent semigroups},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:J8},
     pages = {J1--J7},
     year = {1971-1972},
     publisher = {Secr\'etariat math\'ematique},
     volume = {25},
     number = {2},
     mrnumber = {379317},
     zbl = {0325.06007},
     language = {en},
     url = {https://www.numdam.org/item/SD_1971-1972__25_2_A8_0/}
}
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Saitô, Toru. The orderability of idempotent semigroups. Séminaire Albert Châtelet et Paul Dubreil, Tome 25 (1971-1972) no. 2, Exposé no. J8, 7 p.. https://www.numdam.org/item/SD_1971-1972__25_2_A8_0/

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