La Trobe University - Library: Medieval Music Database - Annual cycle of feasts of liturgical chant, liturgical polyphony and secular music of the late middle ages.

Puis...

anonymous Credo

Sources

Cividale del Friuli: Museo Archeologico Nazionale XCVIII, fol. 2 (1/0) (Contratenor only).

Editions

Italian Sacred and Ceremonial Music, edited by Kurt von Fischer and F. Alberto Gallo, Monaco: Editions de L'Oiseau-Lyre, 1987. Polyphonic Music of the Fourteenth Century XIII, p. 190.