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@article{MZ_1990__203_3_174117, author = {Viktor Schroeder and Susana Fornari}, title = {Ramified {Coverings} with {Nonpositive} {Curvature.}}, journal = {Mathematische Zeitschrift}, pages = {123--128}, publisher = {mathdoc}, volume = {203}, number = {3}, year = {1990}, zbl = {0694.53040}, url = {http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174117/} }
Viktor Schroeder; Susana Fornari. Ramified Coverings with Nonpositive Curvature.. Mathematische Zeitschrift, Tome 203 (1990) no. 3, pp. 123-128. http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174117/