Information on differentia
In the original Cantus index for this manuscript, differentiae were identified by their last note and an arbitrarily-assigned number to distinguish between differentiae of the same mode that shared a common last note.
Helsen, Kate. Inventory of Wolfenbüttel, Herzog August Bibliothek - Musikabteilung, 28 Helmst. (olim D-W 31). Edited by Debra Lacoste. 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-).
Differentiae indexed in consultation with a microfilm facsimile of the manuscript.