Chung, Bo Young, et al. “Effect of Evening Primrose Oil on Korean Patients With Mild Atopic Dermatitis: A Randomized, Double-Blinded, Placebo-Controlled Clinical Study.” Annals of dermatology 30.4 (2018): 409-416.
Gert Laekeman “Assessment report on Oenothera biennis L., Oenothera lamarckiana L., oleum” (2011).