R. Barbagallo, E. Riggi, G. Avola, C. Patane, Biopreservation of ’Birgah’ Eggplant from Polyphenol Oxidase Activity Assayed In Vitro with Onion (Allium Cepa L.) by-products, Chemical Engineering Transactions. 27 (2012) 43-48. doi:10.3303/CET1227008.