TY - JOUR AU - Luisi, Valeria TI - Light rays in static spacetimes with critical asymptotic behavior: a variational approach JO - Electronic Journal of Differential Equations PY - 2006 VL - 2006 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a5/ LA - en ID - EJDE_2006__2006__a5 ER -