@article{10_4064_aa155_3_3,
     author = {Michael A. Bennett and Yann Bugeaud},
     title = {Effective results for restricted rational approximation to quadratic irrationals},
     journal = {Acta Arithmetica},
     pages = {259--269},
     publisher = {mathdoc},
     volume = {155},
     number = {3},
     year = {2012},
     doi = {10.4064/aa155-3-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa155-3-3/}
}