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(en) R. V. Pound, « Gravitational Red-Shift in Nuclear Resonance », Physical Review Letters, vol. 3, no 9, 1e november 1959, p. 439–441 (DOI10.1103/PhysRevLett.3.439, lire en ligne, consulté le )
(en) R. Abuter et al. (collaboration GRAVITY), « Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole », Astronomy and Astrophysics, vol. 615, , p. 1-10, article no L15 (DOI10.1051/0004-6361/201833718, lire en ligne [PDF]).