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In his most recent publication “Improved recursive Green’s function formalism for quasi one-dimensional systems with realistic defects” Fabian shows a significant speedup of his  recursive Green’s function formalism [bibcite key=teichert2017improved]. Based on that, the conductivity of carbon nano tubes can be computed much faster. This allows to compute tubes of realistic size with a huge number of defects. The technical paper shows the tricky algorithms and illustrates its power with a few examples.