1. ISO 13822 (2001), Basis for design of structures. assessment of existing structures, ISO, Geneva, Switzerland (2001)
2. Beconcini, M.L., Croce, P., Marsili, F., Muzzi, M., Rosso, E.: Probabilistic reliability assessment of a heritage structure under horizontal loads. Probab. Eng. Mech. 45, 198–211 (2016)
3. Sanpaolesi, P.: Il Duomo di Pisa e l'architettura romanica toscana delle origini, Pacini, Pisa, Italy (1975) (in Italian)
4. Salmi, M.: L'architettura romanica in Toscana, Bestetti and Tumminelli, Milano, Italy (1926) (in Italian)
5. Tigler, G.: Toscana Romanica, Jaca Book, Milano, Italy (2006)