@article{GFA_1994__4_6_58163,
     author = {D. Burago and K. Teneblat},
     title = {Riemannian {Tori} {Without} {Conjugate} {Points} are {Flat.}},
     journal = {Geometric and functional analysis},
     pages = {259--269},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1994},
     zbl = {0808.53038},
     url = {http://geodesic.mathdoc.fr/item/GFA_1994__4_6_58163/}
}