Society Saint Pius X - Canonical Studies Pontificial Council for the Interpretation of Legislative Texts: Excommunication of the Followers of Archbishop Lefebvre (1996) Rev. Gordon F.Read & Michael Brown Peter J. Vere: Validity of marriages attempted in Society of St. Pius X chapels Sodalitium, Jan 2001: Mgr Lefèbvre's secret (critical studies of internal documents of the Society)