@article{MZ_1986__191_173694,
     author = {Hans-Georg R\"uck},
     title = {Hasse-Witt-Invariants and {Dihedral} {Extension.}},
     journal = {Mathematische Zeitschrift},
     pages = {513--518},
     publisher = {mathdoc},
     volume = {191},
     year = {1986},
     zbl = {0563.12011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173694/}
}