RT Article T1 Un curieux antiphonaire palimpseste de l'office Rouen, A. 292 (IXe s.) JF Revue bénédictine VO 64 IS 1/4 SP 28 OP 45 A1 Hesbert, R. LA French YR 1954 UL https://ixtheo.de/Record/1817536796 DO 10.1484/J.RB.4.04689