Note 9 — Chapter XI · The Basilica of St. Ambrogio
Reading edition
The exponents of the ninth century theory are Dartein, Landriani, and Mongeri, among others, and more recently, Luca Beltrami; and of the theory of a later origin, Kügler, Viollet-le-Duc, Stielh, Cattaneo, Adolfo Venturi, etc.