Broken scale invariance, -attractors and vector impurityÖzgür Akarsu, Sibel Boran, Emre Onur Kahya, Neşe Özdemir and Mehmet OzkanEur. Phys. J. C, 77 5 (2017) 306DOI: https://doi.org/10.1140/epjc/s10052-017-4874-x