• https://ricerca.unistrapg.it/handle/20.500.12071/33928
• https://ricerca.unistrapg.it/handle/20.500.12071/40933
• https://ricerca.unistrapg.it/handle/20.500.12071/34414
• https://ricerca.unistrapg.it/handle/20.500.12071/39951