1. Basilevsk A. (1994). Statistical factor analysis and related methods: theory and applications. Wiley. ISBN 0-471-57082-6.
2. Beghi, R., Spinardi, A., Bodria, L., Mignani, I., & Guidetti, R. (2012). Apples nutraceutic properties evaluation through a visible and near-infrared portable system. Food and Bioprocess Technology. doi: 10.1007/s11947-012-0824-7 .
3. Beni, C., Ianicelli, V., & Di Dio, C. (2001). Il condizionamento dei prodotti ortofrutticoli. Bologna: Edagricole- Edizioni Agricole della Calderini s.r.l.
4. Bobelyn, E., Serban, A. S., Nicu, M., Lammertyn, J., Nicolaï, B. M., & Saeys, W. (2010). Postharvest quality of apple predicted by NIR-spectroscopy: study of the effect of biological variability on spectra and model performance. Postharvest Biology and Technology, 55, 133–143.
5. Brosnan, T., & Sun, D. W. (2004). Improving quality inspection of food products by computer vision - a review. Journal of Food Engineering, 61, 3–16.