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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Equation Icon  ∫ −1 [ μ μν α β μ ] 1∕2 4 I = (16 πG ) (1 + ωu μu )R − K αβ∇ μu ∇ νu + λ (uμu + 1) (− g) d x + Im(ψm, gμν), (41 )