Core-envelope model of super dense star with distinct equation of states R. P. Pant, Satyanarayana Gedela, Ravindra K. Bisht and Neeraj Pant Eur. Phys. J. C, 79 7 (2019) 602 Published online: 17 July 2019 DOI: 10.1140/epjc/s10052-019-7098-4