1. “Electrons and Phonons.”;Ziman,1960
2. To avoid introducing extra symbols, we use the same letter for the potential as a function of position in r space as we do when it is expressed in k space.
3. Strictly speaking, when a phonon is absorbed, the factor contains nai; when one is emitted it contains n+ 1, to allow for spontaneous as well as stimulated emission. This, again, is thoroughly dealt with in the standard texts.
4. ‘Diffuse scattering" of the Fermi electrons in monovalent metals in relation to their electrical resistivities
5. Zur Änderung des elektrischen Widerstandes reiner Metalle am Schmelzpunkt