Doctoral dissertation: The Secret Gospel of Mark is not a fake
(PHYSorg.com Archaeology & Fossils)

In his doctoral dissertation, Timo Paananen examines the letter by the early Christian philosopher Clement of Alexandria (ca. 150-215 CE) to Theodore. The identity of Theodore, recipient of the letter, remains a mystery. Clement instructs him, among other things, by quoting passages from the text known as The Secret Gospel of Mark.