Scalone, D. , Palmeri, R. , Licciardello, F. , Muratore, G. , Todaro, A. , Spagna, G. (2012), 'Influence of Degradative Enzymatic Activities on the Shelf Life of Ready-to-Eat Prickly Pear Fruits', World Academy of Science, Engineering and Technology, Open Science Index 72, International Journal of Agricultural and Biosystems Engineering, 6(12), 1113 - 1116.