@book { PharmakologischeManipulationenDopingimLeistungssportderDDR,
    title = "Pharmakologische Manipulationen (Doping) im Leistungssport der DDR",
    author = "Karl-Josef {Ulmen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1089708"
}