@incollection{AST_2003__287__231_0,
     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},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {287},
     year = {2003},
     mrnumber = {2040007},
     zbl = {1054.37010},
     language = {en},
     url = {http://archive.numdam.org/item/AST_2003__287__231_0/}
}