@article{10_4064_aa104_1_3,
     author = {Daniel R. Replogle and Robert G. Underwood},
     title = {Nontrivial tame extensions over {Hopf} orders},
     journal = {Acta Arithmetica},
     pages = {67--84},
     publisher = {mathdoc},
     volume = {104},
     number = {1},
     year = {2002},
     doi = {10.4064/aa104-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa104-1-3/}
}