@article{10_4064_aa_85_1_35_49,
     author = {Guillaume Grisel},
     title = {Length of continued fractions in principal quadratic fields},
     journal = {Acta Arithmetica},
     pages = {35--49},
     publisher = {mathdoc},
     volume = {85},
     number = {1},
     year = {1998},
     doi = {10.4064/aa-85-1-35-49},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-85-1-35-49/}
}