TY  - GEN
AU  - Atto, bishop of Vercelli
AU  - including Leo VIII, antipope;  also Bruno archbishop of Cologne, Wibold archbishop of Cambrai, Udo, bishop of Strasbourg, Adalgerus bishop (possibly of Augsburg), William monk of  Chalons-sur-Saone.
TI  - Opera omnia Attonis Vercellensis episcopi
AV  - L/Gr BQ 310 .M63 PL134 
PY  - 1853///
CY  - Paris
PB  - Migne
N1  - accedunt Leonis VIII, antipapae;  intermiscentur Brunonis Coloniensis, Wiboldi Cameracensis, archiepiscoporum, Uthonis Argentinensis episcopi, Adalgeri episcopi incertae sedis, Guillelmi Cabillonensis monachi
ER  -