@article{GDZPPN002411911, title = {A Characterization of the Hopf Map by Stretch.}, journal = {Mathematische Zeitschrift}, volume = {129}, year = {1972}, pages = {195-206}, zbl = {0235.53022}, url = {http://dml.mathdoc.fr/item/GDZPPN002411911} }
Hasu, Agnes Chi-Ling. A Characterization of the Hopf Map by Stretch.. Mathematische Zeitschrift, Tome 129 (1972) pp. 195-206. http://gdmltest.u-ga.fr/item/GDZPPN002411911/