Blood flow study of Williamson fluid through stenosed arteries with permeable walls Noreen Sher Akbar, S. U. Rahman, R. Ellahi and S. Nadeem Eur. Phys. J. Plus, 129 11 (2014) 256 Published online: 27 November 2014 DOI: 10.1140/epjp/i2014-14256-2