@book { DieGalerieZumRotenApfel19591965,
    title = "Die Galerie «Zum Roten Apfel» 1959-1965",
    author = "Semirah {Heilingsetzer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095407"
}