Empirical model for electron impact ionization cross sections of neutral atomsM. R. Talukder, S. Bose, M. A.R. Patoary, A. K.F. Haque, M. A. Uddin, A. K. Basak and M. KandoEur. Phys. J. D, 46 2 (2008) 281-287DOI: https://doi.org/10.1140/epjd/e2007-00318-y