From Nicaea I to Nicaea II: Chrêsis in first Ecumenical Council and Chrêsis of the first Ecumenical Council
Article 2: The Eucharist in the Ecumenical Councils
Article 7: Ecumenical Councils and Non-Christian Religions
XIV: On the Seven Holy and Ecumenical Councils
Article 284: Pelagian Requests for an Ecumenical Council
The Ecumenical Potential of the Second Vatican Council