• https://tesi.univpm.it/handle/20.500.12075/9411
• https://tesi.univpm.it/handle/20.500.12075/9499
• https://tesi.univpm.it/handle/20.500.12075/11549
• https://tesi.univpm.it/handle/20.500.12075/21626
• https://tesi.univpm.it/handle/20.500.12075/22591