Anisotropic strange quark stars with a non-linear equation-of-state Ilídio Lopes, Grigoris Panotopoulos and Ángel Rincón Eur. Phys. J. Plus, 134 9 (2019) 454 Published online: 20 September 2019 DOI: 10.1140/epjp/i2019-12842-4