Maixner, M. (2006). Grapevine yellows - Current developments and unsolved questions(PDF). 15th Meeting of the International Council for the Study of Virus and Virus-like Diseases of the Grapevine (ICVG). Stellenbosch: South African Society for Enology and Viticulture. Archived(PDF) from the original on December 21, 2016.
Maixner, M. (2006). Grapevine yellows - Current developments and unsolved questions(PDF). 15th Meeting of the International Council for the Study of Virus and Virus-like Diseases of the Grapevine (ICVG). Stellenbosch: South African Society for Enology and Viticulture. Archived(PDF) from the original on December 21, 2016.