1. 2015 International Year of Light and Light-Based Technologies
http://www.light2015.org/Home.html
2. Was Einstein Right? A Centenary Assessment;Will,2014
3. The Confrontation between General Relativity and Experiment
4. Gravitomagnetic effects;Ruggiero;Nuovo Cim. B,2002
5. Gravitomagnetism and the clock effect;Mashhoon;Lect. Notes Phys.,2001