@book { SigfridAronusForsiusAstronomerandPhilosopherofNature,
    title = "Sigfrid Aronus Forsius. Astronomer and Philosopher of Nature",
    author = "Terhi {Kiiskinen}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103110"
}