Ophiostoma ulmi (Dutch elm disease). Invasive Species Compendium. Centre for Agriculture and Bioscience International. [2021-02-20]. (原始内容存档于2021-03-20).
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Ophiostoma ulmi (Dutch elm disease). Invasive Species Compendium. Centre for Agriculture and Bioscience International. [2021-02-20]. (原始内容存档于2021-03-20).