Study of electron excitation of Rb-like to Br-like tungsten ions and polarization of their photon emission Priti, Lalita Sharma and Rajesh Srivastava Eur. Phys. J. D, 71 4 (2017) 100 Published online: 25 April 2017 DOI: 10.1140/epjd/e2017-70639-3