@book { VertraglicheNebenpflichtenbeimVertragsmanagement, title = "Vertragliche Nebenpflichten beim Vertragsmanagement", author = "Franziska {Ritter}", year = "2016", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-06519-0", url = "https://www.peterlang.com/document/1050070" }