Information on differentia
In the original Cantus index for this manuscript, differentiae were assigned a two-digit code that identified the last note of each differentiae and used a number to distinguish between differentiae in the same mode that shared the same last note.
Carter, Shannon. Inventory of Istanbul, Topkapi Sarayi Müzesi, Deissmann 42. Edited by Debra Lacoste and Elizabeth Sander. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).
The Istanbul Antiphonal. Musicalia Danubiana Series. Budapest: Akadémiai Kiadó, 2002.