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Commemorating the 90th birthday of Jürgen Ehlers (1929-2008) – Republication of: On the Newtonian limit of Einstein’s theory of gravitation, #GenRelativGravit (2019) 51:163 https://t.co/Yyy7bci9iT #GoldenOldie https://t.co/cYvkrku6n8 https://t.co/wmvfP6ust