• In vitro recombinants of two nearly identical potyviral isolates express novel virulence and symptom phenotypes in plantsPaalme, Viiu; Gammelgard, E.; Järvekülg, Lilian; Valkonen, J.P.Journal of general virology2004 / 3, p. 739-747 https://pubmed.ncbi.nlm.nih.gov/14993660/