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@article{PORMA_1966__25_4_114992, author = {Pan, T.K.}, title = {Conformal correspondence of surfaces with conservation of angular spreads}, journal = {Portugaliae mathematica}, pages = {205--210}, publisher = {mathdoc}, volume = {25}, number = {4}, year = {1966}, mrnumber = {0234363}, zbl = {0183.25802}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1966__25_4_114992/} }
Pan, T.K. Conformal correspondence of surfaces with conservation of angular spreads. Portugaliae mathematica, Tome 25 (1966) no. 4, pp. 205-210. http://geodesic.mathdoc.fr/item/PORMA_1966__25_4_114992/