last1=Crellin |first1=J. K. |last2=Philpott |first2=Jane |date=1990 |title=A Reference Guide to Medicinal Plants |url=https://books.google.com.ua/books?id=0JaqB07uTx4C&lpg;=PP1&pg;=PA83 |publisher=Duke University Press |page=83 |isbn=0822310198}} 
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