@book { ArztundNiederlassung, title = "Arzt und Niederlassung", author = "Georg {Kirschner} and Michael {Frehse}", year = "2016", publisher = "Deutscher Ärzteverlag", address = "Köln, Deutschland", doi = "10.47420/9783769135985", url = "https://deutscheraerzteverlag.openpublishing.com/document/390662" }