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van de Graaf, P.; O'Neill, T.M.; Chartier-Hollis, J.M.; Joseph, M.E. (2001). "Susceptibility of clematis varieties and species to stem infection by Phoma clematidina as an indicator for resistance to wilt". European Journal of Plant Pathology. 107 (6): 607–614. doi:10.1023/A:1017902331872. S2CID20130388.