@article{GDZPPN002442868, title = {On the geodesics flow of tori without conjugate points.}, journal = {Mathematische Zeitschrift}, volume = {217}, year = {1994}, pages = {209-216}, zbl = {0807.53039}, url = {http://dml.mathdoc.fr/item/GDZPPN002442868} }
Heber, Jens. On the geodesics flow of tori without conjugate points.. Mathematische Zeitschrift, Tome 217 (1994) pp. 209-216. http://gdmltest.u-ga.fr/item/GDZPPN002442868/