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@article{MZ_1982__180_173182, author = {Guido Van Steen}, title = {Galois {Coverings} of the {Non-Archimedean} {Projective} {Line.}}, journal = {Mathematische Zeitschrift}, pages = {217--224}, publisher = {mathdoc}, volume = {180}, year = {1982}, zbl = {0471.14010}, url = {http://geodesic.mathdoc.fr/item/MZ_1982__180_173182/} }
Guido Van Steen. Galois Coverings of the Non-Archimedean Projective Line.. Mathematische Zeitschrift, Tome 180 (1982), pp. 217-224. http://geodesic.mathdoc.fr/item/MZ_1982__180_173182/