@article{GDZPPN002036304, title = {Angle-preserving transformations of spheres.}, journal = {Aequationes mathematicae}, volume = {33}, year = {1987}, pages = {52-57}, zbl = {0617.51020}, url = {http://dml.mathdoc.fr/item/GDZPPN002036304} }
Lester, J.A. Angle-preserving transformations of spheres.. Aequationes mathematicae, Tome 33 (1987) pp. 52-57. http://gdmltest.u-ga.fr/item/GDZPPN002036304/