@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/}
}