Source: PL-WRu I F 413 Cistercian Gradual (Silesia)Folio: 009rSequence: 1Feast: Nativitas DominiOffice: MASSGenre: IntrCantus ID: g00541Mode: 2Full text: Dominus dixit ad me filius meus es tu ego hodie genui teNotes: Missa in nocte