GASSER 2001, 553-563; MM 1 (see the records of the individual motets)
Further notes:
MM 1, xxx, xxii, adds to this cycle the motet "O beata praesulis" (I-Mfd 1, ff. 108v-109r), which shares motif links with the other motets. This four-motet cycle was first listed among "possible motetti missales cycles" by WARD 1986, 523, n. 56. According to MM 1, xxxii, this cycle has to be ascribed to Gaffurius for stylistic reasons.