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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Equation Icon  ∫ [ I = κR + α1f1(ϕ)R2 + α2f2 (ϕ)RαβR αβ + α3f3 (ϕ )RαβγδR αβγδ + α4f4 (ϕ)∗RR ( ) ] β μν 1∕2 4 − -- g ∂μϕ ∂νϕ + 2V (ϕ) (− g) d x + Im (ψm,gμν), (58 ) 2