@article{TSG_1988-1989__7__33_0,
     author = {Werner Ballmann},
     title = {On the {Dirichlet} problem at infinity for manifolds of non-positive curvature (r\'esum\'e)},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {33--34},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {7},
     year = {1988-1989},
     doi = {10.5802/tsg.65},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/articles/10.5802/tsg.65/}
}