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4. Studies on carcinogenic properties of bracken, Pteridium aquilinum;Hirono;J. Natl. Cancer Inst.,1970
5. Adlerfarn (Pteris aquilina), die Ursache des sog. Stallrotes der Rinder (Haematuria vesicalis bovis chronica);Rosenberger;Deut. Tierärztl. Wochschr.,1960