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https://www.preprints.org/manuscript/201806.0350/v4 Derivation of Generalized Einstein's Equations of Gravitation Based on a Mechanical Model of Vacuum... einstein s equations https://arxiv.org/abs/2107.01487 [2107.01487] Masses at null infinity for Einstein's equations in harmonic coordinates Abstract page for arXiv paper 2107.01487: Masses at null infinity for Einstein's equations in harmonic coordinates einstein s equations