@article{MAN_1971__194_162187,
     author = {D.E. BLAIR and G.D. LUDDEN and K. YANO},
     title = {On the {Intrinsic} {Geometry} of {Sn} x {Sn.}},
     journal = {Mathematische Annalen},
     pages = {68--77},
     publisher = {mathdoc},
     volume = {194},
     year = {1971},
     zbl = {0209.53302},
     url = {http://geodesic.mathdoc.fr/item/MAN_1971__194_162187/}
}