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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Equation Icon  ( − 3 Γ + Λ hydrogen hyperfine transition, H -Maser clock, ||{ 0 0 α = − 1(3Γ + Λ ) electromagnetic mode in cavity, SCSO clock, (16 ) || 2 0 0 ( − 2 Γ 0 phonon mode in solid, principal transition in hydrogen.