Pedrazzini, Alessio, Francesco Pogliacomi, Alessandra Colacicco, Cristina Galavotti, Massimo De Filippo, Silvio Tocco, and Francesco Ceccarelli. 2015. “Triphalangeal Thumb: Case Report and Literature Review”. Acta Bio Medica Atenei Parmensis 86 (3), 290-95. https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/4986.