@article{10_4064_aa154_4_3,
     author = {Andrew Haas},
     title = {Sequences and dynamical systems associated
 with canonical approximation by rationals},
     journal = {Acta Arithmetica},
     pages = {371--384},
     publisher = {mathdoc},
     volume = {154},
     number = {4},
     year = {2012},
     doi = {10.4064/aa154-4-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa154-4-3/}
}