1. One shouldn’t bother with semiconductors, those are dirt effects.“ Wolfgang Pauli 1931, quoted, e.g. as entrance motto in: Manuel Cardona, Theory of defects in semiconductors. Springer Book series Topics of Applied Physics Vol. 104 (2006).
2. The data are taken from U. Goesele: Annual Review of Material Science 18 257−282 (1988).
3. Ludwig Boltzmann (1844−1906), theoretician, founding father of statistical mechanics.