@article{10_1007_s10587_011_0058_2,
     author = {Pan, Xiaowei and Zhang, Wenpeng},
     title = {On {Lehmer's} problem and {Dedekind} sums},
     journal = {Czechoslovak Mathematical Journal},
     pages = {909--916},
     publisher = {mathdoc},
     volume = {61},
     number = {4},
     year = {2011},
     doi = {10.1007/s10587-011-0058-2},
     mrnumber = {2886246},
     zbl = {1249.11090},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.1007/s10587-011-0058-2/}
}