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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Equation Icon  μν μν † 2 † 1 [ μα νβ μναβ] ℒ = [η + (kϕ) ](Dμ ϕ) Dνϕ − m ϕ ϕ − -- η η + (kF) F μνFαβ, (22 ) 4