Hans-Martin Schenke & Hans-Gebhard Bethge 
NHC V, 2-XIII, 1, BG 1 und 4 [PDF ebook] 
(Koptisch-Gnostische Schriften, 3)

Until his retirement in 1994, Prof. Emeritus Dr. Dr. Hans Schenke taught New Testament Studies at the Humboldt University of Berlin. He died in 2002.
Dr. Hans-Gebhard Bethge is Professor of New Testament Studies at the Humboldt University of Berlin.
Ursula Ulrike-Kaiser is a member of academic staff in the Department of New Testament Studies at the Humboldt University of Berlin.