no. 1
Some remarks on ordered fields
Séminaire Albert Châtelet et Paul Dubreil, Tome 28 (1974-1975) no. 1, Exposé no. 26, 4 p. 
@article{SD_1974-1975__28_1_A20_0,
     author = {Nagata, Masayoshi},
     title = {Some remarks on ordered fields},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:26},
     pages = {1--4},
     year = {1974-1975},
     publisher = {Secr\'etariat math\'ematique},
     volume = {28},
     number = {1},
     mrnumber = {392959},
     zbl = {0333.12107},
     language = {en},
     url = {https://www.numdam.org/item/SD_1974-1975__28_1_A20_0/}
}
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Nagata, Masayoshi. Some remarks on ordered fields. Séminaire Albert Châtelet et Paul Dubreil, Tome 28 (1974-1975) no. 1, Exposé no. 26, 4 p.. https://www.numdam.org/item/SD_1974-1975__28_1_A20_0/