1. Gravity: An Introduction to Einstein's General Relativity by James B. Hartle

2. Lectures on Quantum Gravity by Gomberoff, Andres, Marolf, Donald

3. Gravity, Geoid and Space Missions: GGSM 2004. IAG International Symposium. Porto, Portugal. August 30 - September 3, 2004
Christopher Jekeli (Editor), Luisa M.C. Bastos (Editor), Joana Fernandes (Editor)