@book { LettersofLove,
    title = "Letters of Love",
    subtitle = "Franz Rosenzweig’s Spiritual Biography and Oeuvre in Light of the Gritli Letters",
    author = "Ephraim {Meir}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1100367"
}