Environmental risks assessment and preventive conservation strategy for the Pórtico de la Gloria, Santiago de compostela Cathedral

1. Becherini, F.
2. Bernardi, A.
3. Vivarelli, A.
4. Pockelé, L.
5. de Grandi, S.
6. Gandini, A.
7. García, O.
8. Zubiaga, M.
9. Espada Suárez, J.C.
10. Sperandio, B.