@book { DasGesundheitsweseninDeutschland, title = "Das Gesundheitswesen in Deutschland", author = "Eckhard {Nagel}", year = "2016", publisher = "Deutscher Ärzteverlag", address = "Köln, Deutschland", doi = "10.47420/9783769135954", url = "https://deutscheraerzteverlag.openpublishing.com/document/390659" }