M. Lambri, A. Roda, R. Dordoni, M. Fumi, D. De Faveri, Mild Process for Dehydrated Food-grade Crude Papain Powder from Papaya Fresh Pulp: Lab-scale and Pilot Plant Experiments, Chemical Engineering Transactions. 38 (2014) 7-12. doi:10.3303/CET1438002.