Perfect fluid tori orbiting Kehagias–Sfetsos naked singularities Z. Stuchlík, D. Pugliese, J. Schee and H. Kučáková Eur. Phys. J. C, 75 9 (2015) 451 Published online: 25 September 2015 DOI: 10.1140/epjc/s10052-015-3663-7