@book { NachvertraglichesWettbewerbsverbotdesGmbHGeschftsfhrers,
    title = "Nachvertragliches Wettbewerbsverbot des GmbH-Geschäftsführers",
    author = "Sven {Büttner}",
    year = "2023",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b21174",
    url = "https://www.peterlang.com/document/1368727"
}