Kleiber, R., Hatzky, R., Könies, A., Kauffmann, K., & Helander, P. (2011). Application of an enhanced control-variate scheme for particle-in-cell simulations with and without collisions. Talk presented at 22nd International Conference on Numerical Simulations of Plasmas. Long Branch. 2011-09-07 - 2011-09-09.