On the divergence of geodesic rays in manifolds without conjugate points, dynamics of the geodesic flow and global geometry
Geometric methods in dynamics (II) : Volume in honor of Jacob Palis, Astérisque, no. 287 (2003), pp. 231-249 
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     author = {Ruggiero, Rafael Oswaldo},
     title = {On the divergence of geodesic rays in manifolds without conjugate points, dynamics of the geodesic flow and global geometry},
     booktitle = {Geometric methods in dynamics (II) : Volume in honor of Jacob Palis},
     editor = {de Melo, Wellington and Viana, Marcelo and Yoccoz, Jean-Christophe},
     series = {Ast\'erisque},
     pages = {231--249},
     year = {2003},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {287},
     mrnumber = {2040007},
     zbl = {1054.37010},
     language = {en},
     url = {https://www.numdam.org/item/AST_2003__287__231_0/}
}
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Ruggiero, Rafael Oswaldo. On the divergence of geodesic rays in manifolds without conjugate points, dynamics of the geodesic flow and global geometry, dans Geometric methods in dynamics (II) : Volume in honor of Jacob Palis, Astérisque, no. 287 (2003), pp. 231-249. https://www.numdam.org/item/AST_2003__287__231_0/

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