• https://www.iris.unict.it/handle/20.500.11769/596909
• https://www.iris.unict.it/handle/20.500.11769/614561
• https://www.iris.unict.it/handle/20.500.11769/717392
• https://www.iris.unict.it/handle/20.500.11769/542382
• https://www.iris.unict.it/handle/20.500.11769/705938