On a very rare silver coin (Denaro d'Argento) of Berengarius II., King of Italy, with his son Albertus, as co-regent

by Pfister, Johann Georg
Published 1855

Monete di zecche italiane inedite

by Promis, Domenico Casimiro 1804-1874
Published 1867

<<Le>> monete di Venezia

by Papadopoli, Nicolò
Published 1893

Catalogo della collezione posseduta dagli eredi

by Avignone, Gaetano
Published 1895