@article{10_4064_aa115_3_2,
     author = {T. W. M\"uller and J.-C. Schlage-Puchta},
     title = {On the number of primitive $\lambda $-roots},
     journal = {Acta Arithmetica},
     pages = {217--223},
     publisher = {mathdoc},
     volume = {115},
     number = {3},
     year = {2004},
     doi = {10.4064/aa115-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa115-3-2/}
}