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Jing-Gang Xie,  Gravitational Frequency Shifts for Photons and Particles.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2017, vol. 121(1). 1 - 5[viewed 22 September 2017]. Available from: http://waset.org/publications/10005968.