@article{IM_1984__77_143162,
     author = {Kay Wingberg},
     title = {Ein {Analogon} zur {Fundamentalgruppe} einer {Riemann'schen} {Fl\"ache} im {Zahlk\"operfall.}},
     journal = {Inventiones mathematicae},
     pages = {557--584},
     publisher = {mathdoc},
     volume = {77},
     year = {1984},
     zbl = {0563.12008},
     url = {http://geodesic.mathdoc.fr/item/IM_1984__77_143162/}
}