M. Degiovanni et A. Giacomini, Geodesical connectedness on stationary Lorentzian manifolds with nonsmoothboundary, NONLIN ANAL, 47(8), 2001, pp. 5041-5052
The existence and multiplicity of geodesics joining two given events in a L
orentzian manifold is studied. The assumptions cover the case of the exteri
or of a black hole.