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@article{IM_1995__120_2_144275, author = {Christopher B. Croke and Bruce Kleiner}, title = {On tori without conjugate points.}, journal = {Inventiones mathematicae}, pages = {241--258}, publisher = {mathdoc}, volume = {120}, number = {2}, year = {1995}, zbl = {0842.53028}, url = {http://geodesic.mathdoc.fr/item/IM_1995__120_2_144275/} }
Christopher B. Croke; Bruce Kleiner. On tori without conjugate points.. Inventiones mathematicae, Tome 120 (1995) no. 2, pp. 241-258. http://geodesic.mathdoc.fr/item/IM_1995__120_2_144275/