Brandi, Giovanna, Stefania Di Girolamo, Fiorella Belpoggi, Gianluca Grazi, Giorgio Ercolani, and Guido Biasco. 2008. “Asbestos Exposure in Patients Affected by Bile Duct Tumours”. European Journal of Oncology and Environmental Health 13 (3): 171-80. https://mattioli1885journals.com/index.php/EJOEH/article/view/3924.