In the original Cantus index, the differentiae are identified by their last note and an arbitrarily-assigned number within each mode.
Sanda, Anna. Inventory of Praha (Prague), Strahovská knihovna (Library of the Royal Canonry of Premonstratensians at Strahov), DE I 7. Edited by Gábor Kiss and Zsuzsa Czagány. In: Cantus: A 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-).
Images: Breviarium notatum Strigoniense, DE I 7, Královská kanonie premonstrátu na Strahove, Praha, Cesko
Standardized manuscript tonary completed by Rebecca Shaw (Dalhousie University) on February 22, 2018. Edited by Jennifer Bain, Sister Ilaria Culshaw, and Lucia Denk (Dalhousie University) on July 24, 2019 and Rebecca Shaw on August 7, 2019.