Source: PL-WRu I F 411 Cistercian Gradual (Silesia)Folio: 008vSequence: 4Feast: Nativitas DominiOffice: MASSGenre: ComCantus ID: g00546Mode: 6TFull text: In splendoribus sanctorum ex utero ante luciferum genui teNotes: [Missa in nocte]