Quark stars with isotropic matter in Hořava gravity and Einstein–æther theory Grigorios Panotopoulos, Daniele Vernieri and Ilidio Lopes Eur. Phys. J. C, 80 6 (2020) 537 Published online: 15 June 2020 DOI: 10.1140/epjc/s10052-020-8105-5