Vitali, Marco, Mario Tamagnone, La IaconaTiziana, and Claudio Lovisolo. “Measurement of Grapevine Canopy Leaf Area by Using an Ultrasonic-Based Method”. OENO One 47, no. 3 (September 30, 2013): 183-189. Accessed July 6, 2020. https://oeno-one.eu/article/view/1553.