Models of charged compact objects with generalized polytropic equation of state I. Noureen, S. A. Mardan, M. Azam, W. Shahzad and S. Khalid Eur. Phys. J. C, 79 4 (2019) 302 Published online: 03 April 2019 DOI: 10.1140/epjc/s10052-019-6806-4