Terahertz generation from single and multiple filaments in air O. Kosareva, N. Panov, D. Shipilo, V. Andreeva, T.-J. Wang, Y. Chen, W. Liu, A. Savel’ev and A. Shkurinov EPJ Web Conf., 195 (2018) 03013 Published online: 23 November 2018 DOI: 10.1051/epjconf/201819503013