@article{10_4064_aa_34_4_287_293,
     author = {T. Cusick and Michel Mend\`es France},
     title = {The {Lagrange} spectrum of a set},
     journal = {Acta Arithmetica},
     pages = {287--293},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1977},
     doi = {10.4064/aa-34-4-287-293},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-34-4-287-293/}
}