Illg, Christian, Haag, Michael, Teeny, Nicolas, Wirth, Jens, Fähnle, Manfred (2016). Physical and mathematical justification of the numerical Brillouin zone integration of the Boltzmann rate equation by Gaussian smearing. *Journal of Theoretical and Applied Physics*, 0(1), 1-6. 10.1007/s40094-015-0193-5