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    Zu axialsymmetrischen stationären Lösungen der Einsteinschen Feldgleichungen für das Vakuum

    For axialsymmetric stationary vacuum fields Einstein equations reduce to a system, derivable from a simple Lagrangian. An investigation of its forminvariance leads to a method to construct from known solutions...

    D. Kramer, G. Neugebauer in Communications in Mathematical Physics (1968)

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    Algebraisch spezielle Einstein-Räume mit einer Bewegungsgruppe

    In algebraically special Einstein spaces (Rμv=0) with a hypersurfaceorthogonal spacelike Killing vector field ξv, the trajectories of the multiple eigen null directions kμ lie — except one case — in the subspaces

    D. Kramer, G. Neugebauer in Communications in Mathematical Physics (1968)