• http://elea.unisa.it/xmlui/handle/10556/6599
• http://elea.unisa.it/xmlui/handle/10556/6600
• http://elea.unisa.it/xmlui/handle/10556/6601
• http://elea.unisa.it/xmlui/handle/10556/6602
• http://elea.unisa.it/xmlui/handle/10556/6603