@article{JRAM_1983__343_152553,
     author = {Robert C. Valentini and Daniel J. Madden},
     title = {The group of automorphisms of algebraic function fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {162--168},
     publisher = {mathdoc},
     volume = {343},
     year = {1983},
     zbl = {0502.12016},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1983__343_152553/}
}