• Kowalski R., Baj T., Kowalska G., Pankiewicz K.:  Estimation of Potential Availability of Essential Oil in Some Brands of Herbal Teas and Herbal Dietary Supplements (2015 r.) PLoS One 2015, Vol. 10, 6, e0130714
  • Kowalski R., Kowalska G., Jamroz J., Nawrocka A., Metyk D.:  Effect of the ultrasound-assisted preliminary maceration on the efficiency of the essential oil distillation from selected herbal raw materials. (2015 r.) Ultrasonics Sonochemistry 2015, Vol. 24, 214-220