• https://air.unipr.it/handle/11381/2928436
• https://air.unipr.it/handle/11381/3041750
• https://air.unipr.it/handle/1889/6662
• https://air.unipr.it/handle/1889/5001
• https://air.unipr.it/handle/11381/2957394
• https://air.unipr.it/handle/11381/3019243
• https://air.unipr.it/handle/11381/3044233