@article{CRMATH_2004__339_10_709_0,
     author = {Fan, Aihua and Zhu, Hao},
     title = {Level sets of \protect\emph{\ensuremath{\beta}}-expansions},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {709--712},
     publisher = {Elsevier},
     volume = {339},
     number = {10},
     year = {2004},
     doi = {10.1016/j.crma.2004.09.026},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.09.026/}
}