Bender, Melanie. The Dawn of the Invisible: The Reception of the Platonic Doctrine on Beauty in the Christian Middle Ages: Pseudo-Dionysius the Areopagite – Albert the Great – Thomas Aquinas – Nicholas of Cusa. TESTINSTANZ: Wissenschaftliche Schriften der Universität Münster, 2010, https://www.uni-muenster.de/EbooksTestInstallation/index.php/series/catalog/book/62.