@book { RckengesundheitNeueaktiveWege, title = "Rückengesundheit - Neue aktive Wege", author = "Klaus {Pfeifer}", year = "2020", publisher = "Deutscher Ärzteverlag", address = "Köln, Deutschland", doi = "10.47420/9783769137378", url = "https://deutscheraerzteverlag.openpublishing.com/document/945752" }