@article{JRAM_1972__254_151221,
     author = {G. Frey and W.D. Geyer},
     title = {\"Uber die {Fundamentalgruppe} von {K\"orpern} mit {Divisorentheorie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {110--122},
     publisher = {mathdoc},
     volume = {254},
     year = {1972},
     zbl = {0238.12006},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__254_151221/}
}