no. 2
Lattice-ordered demigroups
Séminaire Albert Châtelet et Paul Dubreil, Tome 14 (1960-1961) no. 2, Exposé no. 19, 26 p. 
@article{SD_1960-1961__14_2_A3_0,
     author = {Birkhoff, Garrett},
     title = {Lattice-ordered demigroups},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:19},
     pages = {1--26},
     year = {1960-1961},
     publisher = {Secr\'etariat math\'ematique},
     volume = {14},
     number = {2},
     zbl = {0122.02101},
     language = {en},
     url = {https://www.numdam.org/item/SD_1960-1961__14_2_A3_0/}
}
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Birkhoff, Garrett. Lattice-ordered demigroups. Séminaire Albert Châtelet et Paul Dubreil, Tome 14 (1960-1961) no. 2, Exposé no. 19, 26 p.. https://www.numdam.org/item/SD_1960-1961__14_2_A3_0/