@article{10_4153_CJM_2007_009_3,
     author = {Roy, Damien},
     title = {On {Two} {Exponents} of {Approximation} {Related} to a {Real} {Number} and {Its} {Square}},
     journal = {Canadian journal of mathematics},
     pages = {211--224},
     year = {2007},
     volume = {59},
     number = {1},
     doi = {10.4153/CJM-2007-009-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2007-009-3/}
}