1. H. Fuchs, Graduate Texts in physics,Type="Italic"> 2nd edn. Springer, Berlin (2010)
2. H. Fuchs, EHS, 1(3–4), 253 (2014).
3. A. Feldhoff EHS, 2(1), 5 (2015).
4. A. Feldhoff and B. Geppert, EHS, 2(1–2), 69 (2014).
5. B. Geppert, D. Groeneveld, V. Loboda, A. Korotkov, and A. Feldhoff, EHS, 10, 689 (2008).