Disappearance of Self-Focusing for Few-Cycle THz PulsesS.A. Kozlov, A.A. Drozdov, M.A. Kniazev, D.A. Kislin, S. Choudhary and R.W. BoydEPJ Web Conf., 195 (2018) 07002DOI: https://doi.org/10.1051/epjconf/201819507002
