@book { AntonRaphaelMengsWirkeninSpanien,
    title = "Anton Raphael Mengs’ Wirken in Spanien",
    author = "Pia {Hollweg}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104721"
}