@book { ContendingForces,
    title = "Contending Forces",
    author = "Sabina {Matter-Seibel}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03886-6",
    url = "https://www.peterlang.com/document/1044223"
}