@book { GeschftsmodellkonvergenzimHandel,
    title = "Geschäftsmodellkonvergenz im Handel",
    author = "Andrea {Buschmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18033",
    url = "https://www.peterlang.com/document/1059366"
}