1. Berndt H, Hermann M, Kreye H D, Reinisch R, Scherer U, Vanzetta J. Transmission code 2007—network and system rules of the German transmission grid operators. 2007, https://www.bdew.de/internet.nsf/id/A2A0475F2FAE8F44C12578300047C92F/$file/TransmissionCode2007.pdf (in German)
2. Bundesnetzagentur. The 3th quarterly report on network and system safety measures, 4th quarterly report and overall annual inspection. 2015, http://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Allgemeines/Bundesnetzagentur/Publikationen/Berichte/2016/Quartalsbericht_Q4_2015.pdf?blob= publicationFile&v = 1 (in German)
3. Bundesnetzagentur. Quarterly report on network and system security regulations. First quarter 2016. 2016, http://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Allgemeines/Bundesnetzagentur/Publikationen/Berichte/2016/Quartalsbericht_ Q1_2016.pdf?__blob = publicationFile&v = 2 (in German)
4. Umweltbundesamt. The potential of controllable loads in an energy supply system with growing share of renewable energy. 2015, https://www.umweltbundesamt.de/sites/default/files/medien/378/publikationen/climate_change_19_2015_potentiale_regelbarer_lasten. pdf (in German)
5. Götz M, Lefebvre J, Mörs F, McDaniel Koch A, Graf F, Bajohr S, Reimert R, Kolb T. Renewable power-to-gas: a technological and economic review. Renewable Energy, 2016, 85: 1371–1390 (in German)