• https://research.unipg.it/handle/11391/1623281
• https://research.unipg.it/handle/11391/1601994
• https://research.unipg.it/handle/11391/1617675
• https://research.unipg.it/handle/11391/1614483
• https://research.unipg.it/handle/11391/1597320
• https://research.unipg.it/handle/11391/1571038
• https://research.unipg.it/handle/11391/1595535