@book { TheConceptofTimeinOrigen,
    title = "The Concept of Time in Origen",
    author = "Panayiotis {Tzamalikos}",
    year = "1991",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/b23620",
    url = "https://www.peterlang.com/document/1736365"
}