@article{EJDE_2006__2006__a5,
     author = {Luisi, Valeria},
     title = {Light rays in static spacetimes with critical asymptotic behavior: a variational approach},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2006},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a5/}
}