Winterhagen, P., G. Brendel, G. Krczal, and G.M. Reustle. 2016. “Development of an in Vitro Dual Culture System for Grapevine and Xiphinema Index As a Tool for Virus Transmission”. South African Journal of Enology and Viticulture 28 (1):1-5. https://doi.org/10.21548/28-1-1452.