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@article{AM2_1990__40_1_137357, author = {B. Alpers}, title = {Note on angle-preserving mappings.}, journal = {Aequationes mathematicae}, pages = {1--7}, publisher = {mathdoc}, volume = {40}, number = {1}, year = {1990}, zbl = {0712.51010}, url = {http://geodesic.mathdoc.fr/item/AM2_1990__40_1_137357/} }
B. Alpers. Note on angle-preserving mappings.. Aequationes mathematicae, Tome 40 (1990) no. 1, pp. 1-7. http://geodesic.mathdoc.fr/item/AM2_1990__40_1_137357/