@article{10_4064_aa_81_1_1_10,
     author = {Yi Ouyang and Fei Xu},
     title = {Riemann-Hurwitz formula in basic $\ensuremath{\mathbb{Z}}_S$-extensions},
     journal = {Acta Arithmetica},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {81},
     number = {1},
     year = {1997},
     doi = {10.4064/aa-81-1-1-10},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-81-1-1-10/}
}