no. 2
Quasi-regularity in semigroups
Séminaire Albert Châtelet et Paul Dubreil, Tome 23 (1969-1970) no. 2, Exposé no. DG 1, 3 p. 
@article{SD_1969-1970__23_2_A1_0,
     author = {Oehmke, Robert H.},
     title = {Quasi-regularity in semigroups},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:DG 1},
     pages = {DG1--DG3},
     year = {1969-1970},
     publisher = {Secr\'etariat math\'ematique},
     volume = {23},
     number = {2},
     zbl = {0231.20020},
     language = {en},
     url = {https://www.numdam.org/item/SD_1969-1970__23_2_A1_0/}
}
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Oehmke, Robert H. Quasi-regularity in semigroups. Séminaire Albert Châtelet et Paul Dubreil, Tome 23 (1969-1970) no. 2, Exposé no. DG 1, 3 p.. https://www.numdam.org/item/SD_1969-1970__23_2_A1_0/