La porta di Bonanno nel duomo di Pisa e le porte bronzee medioevali europee : arte e tecnologia : atti del convegno internazionale di studi; Pontedera; Bandecchi & Vivaldi ;
On the technique and metallurgical composition of the Romanesque bronze doors (completed ca.1065) of the cathedral of Augsburg. Divides the panels into two groups, based on technical and stylistic differences, and suggests that the panels were completed in different periods by separate artists. ;