@journal {et_2019_04, title = "Zeitschrift et ? Energiewirtschaftliche Tagesfragen 04/2019", journal = "Zeitschrift et ? Energiewirtschaftliche Tagesfragen", ISSN = "0720-6240 ", year = "2019", number = "4", doi = "et_2019_04", url = "https://content-select.com/index.php?id=bib_view&doi=et_2019_04", publisher = "VDE Verlag", language = "", }