1. Fox A (2011) Symptomatic survey of virus complexes of carrot. Horticultural Development Company. Available: http://www.hdc.org.uk/project/carrot-symptomatic-survey-virus-complexes-4. Accessed 2014 June 25.
2. Brunt AA, Crabtree K, Dallwitz MJ, Gibbs AJ, Watson L, et al. (1996) Plant Viruses Online: Descriptions and Lists from the VIDE Database. Available: http://pvo.bio-mirror.cn/refs.htm. Accessed 2014 June 25.
3. Survey and biological differentiation of viruses of wild and cultivated umbelliferae in the Netherlands;P Dijk;Netherlands Journal of Plant Pathology,1989
4. Identification of two viruses associated with the carrot yellow leaf syndrome;S Yamashita;Annual Phytopathology Society of Japan,1976
5. Transmission and differentiation of six viruses infecting hogweed (Heracleum sphondylium) in Scotland;F Bem;Annals of Applied Biology,1979