Hesslow, L., Embreus, O., Hoppe, M., DuBois, T. C., Papp, G., Rahm, M., & Fülöp, T. (2018). Generalized collision operator for fast electrons interacting with partially ionized impurities. Journal of Plasma Physics, 84(6):. doi:10.1017/S0022377818001113.