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Basch, E., Bent, S., Foppa, I., Haskmi, S., Kroll, D., Mele, M., … Yong, S. (2006). Marigold (Calendula officinalisL.). Journal of Herbal Pharmacotherapy, 6(3-4), 135–159. doi:10.1080/j157v06n03_08 
10.1080/j157v06n03_08
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