G-essence with Yukawa interactions I. Kulnazarov, K. Yerzhanov, O. Razina, Sh. Myrzakul, P. Tsyba and R. Myrzakulov Eur. Phys. J. C, 71 7 (2011) 1698 Published online: 22 July 2011 DOI: 10.1140/epjc/s10052-011-1698-y