D. Goszczynski, G. Kasdorf, G. Pietersen, and H. van Tonder, “Grapevine Leafroll-Associated Virus 2 (GLRaV-2)- Mechanical Transmission, Purification, Production and Properties of Antisera, Detection by ELISA”, SAJEV, vol. 17, no. 1, pp. 15–26, May 2017.