@book { PartialsynthetischeVersucheaufdemGebietderFrangulaEmodinglycoside,
    title = "Partialsynthetische Versuche auf dem Gebiet der Frangula-Emodinglycoside",
    author = "Paul-Jürg {Lyk}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069206"
}