Circular polarization of radio emission from air showers in thunderstorm conditions T.N.G. Trinh, O. Scholten, A. Bonardi, S. Buitink, A. Corstanje, U. Ebert, J. E. Enriquez, H. Falcke, J.R. Hörandel, P. Mitra et al. (9 more) EPJ Web Conf., 135 (2017) 03002 Published online: 15 March 2017 DOI: 10.1051/epjconf/201713503002