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Gardan et al. (Apr 1999). “DNA relatedness among the pathovars of Pseudomonas syringae and description of Pseudomonas tremae sp. nov. and Pseudomonas cannabina sp. nov. (ex Sutic and Dowson 1959)”. Int J Syst Bacteriol49 (2): 469–78. doi:10.1099/00207713-49-2-469. PMID10319466.