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Lua i Stíl Chicago (17ú heag.)Christensen, J. J. Corn Smut Caused by Ustilago Maydis. St. Paul: American Phytopathological Society, 1963.
Lua MLA (8ú heag.)Christensen, J. J. Corn Smut Caused by Ustilago Maydis. American Phytopathological Society, 1963.
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