@article{SDPP_1977-1978__19_2_A5_0,
     author = {Mend\`es France, Michel},
     title = {Sur le spectre de {Lagrange} d'un ensemble de nombres r\'eels},
     journal = {S\'eminaire Delange-Pisot-Poitou. Th\'eorie des nombres},
     note = {talk:30},
     pages = {1--5},
     publisher = {Secr\'etariat math\'ematique},
     volume = {19},
     number = {2},
     year = {1977-1978},
     zbl = {0409.10019},
     language = {fr},
     url = {http://archive.numdam.org/item/SDPP_1977-1978__19_2_A5_0/}
}