no. 2
Sur le spectre de Lagrange d'un ensemble de nombres réels
Séminaire Delange-Pisot-Poitou, Tome 19 (1977-1978) no. 2, Exposé no. 30, 5 p. 
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     author = {Mend\`es France, Michel},
     title = {Sur le spectre de {Lagrange} d'un ensemble de nombres r\'eels},
     journal = {S\'eminaire Delange-Pisot-Poitou},
     note = {talk:30},
     pages = {1--5},
     year = {1977-1978},
     publisher = {Secr\'etariat math\'ematique},
     volume = {19},
     number = {2},
     zbl = {0409.10019},
     language = {fr},
     url = {https://www.numdam.org/item/SDPP_1977-1978__19_2_A5_0/}
}
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Mendès France, Michel. Sur le spectre de Lagrange d'un ensemble de nombres réels. Séminaire Delange-Pisot-Poitou, Tome 19 (1977-1978) no. 2, Exposé no. 30, 5 p.. https://www.numdam.org/item/SDPP_1977-1978__19_2_A5_0/

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