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\bibitem{Okhrimovskyy_etal2002} {\textquotedblleft}\textit{Electron anisotropic scattering in gases: a formula for Monte Carlo simulations}{\textquotedblright}. Okhrimovskyy A, Bogaerts A, Gijbels R, Physical review : E : statistical, nonlinear, and soft matter physics \textbf{65}, 037402 (2002).   http://doi.org/10.1103/PhysRevE.65.037402

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