Tavakolizadeh, M. et al. 2018. Effect of Powder Sizes, pH of Water, Ultrasound and Method of Distillation on Extraction of Fennel Essential Oil and Anethole Content: Effect of some conditions on essential oil of fennel. Iranian Journal of Pharmaceutical Sciences. 14, 1 (Jan. 2018), 35–44. DOI:https://doi.org/10.22037/ijps.v14.40670.