@article{10_4153_CMB_1991_006_4,
     author = {Brown, Tom C.},
     title = {A {Characterization} of the {Quadratic} {Irrationals}},
     journal = {Canadian mathematical bulletin},
     pages = {36--41},
     year = {1991},
     volume = {34},
     number = {1},
     doi = {10.4153/CMB-1991-006-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-006-4/}
}