Dynamics of coupled phantom and tachyon fields M. Shahalam, S. D. Pathak, Shiyuan Li, R. Myrzakulov and Anzhong Wang Eur. Phys. J. C, 77 10 (2017) 686 Published online: 17 October 2017 DOI: 10.1140/epjc/s10052-017-5255-1