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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Equation Icon  ∫ −1 [ −1 μν 2 ] 1∕2 4 I = (16πG ) ϕR − ϕ ω (ϕ)g ∂μϕ∂ νϕ − ϕ V (− g) d x + Im (ψm, gμν), (35 )