@article{1178240651, author = {Nagy, P. T.}, title = {On the tangent sphere bundle of a Riemannian 2-manifold}, journal = {Tohoku Math. J. (2)}, volume = {29}, number = {4}, year = {1977}, pages = { 203-208}, language = {en}, url = {http://dml.mathdoc.fr/item/1178240651} }
Nagy, P. T. On the tangent sphere bundle of a Riemannian 2-manifold. Tohoku Math. J. (2), Tome 29 (1977) no. 4, pp. 203-208. http://gdmltest.u-ga.fr/item/1178240651/