2016
Synodality and Primacy during the First Millennium: Towards a Common Understanding in Service of the Unity of the Church - Chieti 2016
2007
Ecclesiological and Canonical Consequences of the Sacramental Nature of the Church: Ecclesial Communion, Conciliarity and Authority - Ravenna 2007
1988
The Sacrament of Order in the Sacramental Structure of the Church with Particular Reference to the Importance of Apostolic Succession for the Sanctification and Unity of the People of God - Valamo 1988
1982
The Mystery of the Church and of the Eucharist in the Light of the Mystery of the Holy Trinity - Munich 1982