Speed of sound in hadronic matter using non-extensive Tsallis statistics Arvind Khuntia, Pragati Sahoo, Prakhar Garg, Raghunath Sahoo and Jean Cleymans Eur. Phys. J. A, 52 9 (2016) 292 Published online: 22 September 2016 DOI: 10.1140/epja/i2016-16292-9