@article{10_1007_s10587_013_0033_1,
     author = {Cao, Chunyun and Wu, Jun and Zhang, Zhenliang},
     title = {The efficiency of approximating real numbers by {L\"uroth} expansion},
     journal = {Czechoslovak Mathematical Journal},
     pages = {497--513},
     publisher = {mathdoc},
     volume = {63},
     number = {2},
     year = {2013},
     doi = {10.1007/s10587-013-0033-1},
     mrnumber = {3073974},
     zbl = {06236427},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-013-0033-1/}
}