no. 1
Semimetrics, semiécarts in ordered semigroups
Séminaire Albert Châtelet et Paul Dubreil, Tome 24 (1970-1971) no. 1, Exposé no. 1, 4 p. 
@article{SD_1970-1971__24_1_A1_0,
     author = {Krishnan, Viakalathur S.},
     title = {Semimetrics, semi\'ecarts in ordered semigroups},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:1},
     pages = {1--4},
     year = {1970-1971},
     publisher = {Secr\'etariat math\'ematique},
     volume = {24},
     number = {1},
     mrnumber = {417012},
     zbl = {0243.54021},
     language = {en},
     url = {https://www.numdam.org/item/SD_1970-1971__24_1_A1_0/}
}
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Krishnan, Viakalathur S. Semimetrics, semiécarts in ordered semigroups. Séminaire Albert Châtelet et Paul Dubreil, Tome 24 (1970-1971) no. 1, Exposé no. 1, 4 p.. https://www.numdam.org/item/SD_1970-1971__24_1_A1_0/