@article{JEMS_2009_11_4_a6,
     author = {Jos\'e M. Espinar and Jos\'e A. G\'alvez and Pablo Mira},
     title = {Hypersurfaces in $\mathbb{H}^{n+1}$ and conformally invariant equations: the generalized {Christoffel} and {Nirenberg} problems},
     journal = {Journal of the European Mathematical Society},
     pages = {903--939},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {2009},
     doi = {10.4171/jems/170},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/170/}
}