@article{GDZPPN00230547X, title = {On the Intrinsic Geometry of Sn x Sn.}, journal = {Mathematische Annalen}, volume = {193}, year = {1971}, pages = {68-77}, zbl = {0209.53302}, url = {http://dml.mathdoc.fr/item/GDZPPN00230547X} }
BLAIR, D.E.; LUDDEN, G.D.; YANO, K. On the Intrinsic Geometry of Sn x Sn.. Mathematische Annalen, Tome 193 (1971) pp. 68-77. http://gdmltest.u-ga.fr/item/GDZPPN00230547X/