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Lisa Smiley "CascadeArchived August 29, 2015, at the Wayback Machine" Iowa State University, 2008. Accessed: April 13th, 2008
CAB International and European and Mediterranean Plant Protection Organization "Tomato ringspot nepovirusArchived July 10, 2012, at the Wayback Machine" Data Sheets on Quarantine Pests. Accessed: April 13th, 2013