Electromagnetic waves in an axion-active relativistic plasma non-minimally coupled to gravityAlexander B. Balakin, Ruslan K. Muharlyamov and Alexei E. ZayatsEur. Phys. J. C, 73 12 (2013) 2647DOI: https://doi.org/10.1140/epjc/s10052-013-2647-8