Chimera states in a two–population network of coupled pendulum–like elements T. Bountis, V.G. Kanas, J. Hizanidis and A. Bezerianos Eur. Phys. J. Special Topics, 223 4 (2014) 721-728 Published online: 28 April 2014 DOI: 10.1140/epjst/e2014-02137-7