Lemmetty, A., J. Laamanen, M. Soukainen, and J. Tegel. “Emerging Virus and Viroid Pathogen Species Identified for the First Time in Horticultural Plants in Finland in 1997-2010”. Agricultural and Food Science, vol. 20, no. 1, Jan. 2011, pp. 29-41, doi:10.2137/145960611795163060.