@book { FestschriftfrHansBerndHarderzum60Geburtstag,
    title = "Festschrift für Hans-Bernd Harder zum 60. Geburtstag",
    author = "Klaus {Harer} and Helmut {Schaller}",
    year = "1995",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12955",
    url = "https://www.peterlang.com/document/1067301"
}