Hudz, N., N. Nikolaieva, C. Konyk, I. Kaplun, J. Šimková, and O. Grygorieva. “Methods of Determination of Sum of Flavonoids in Herbal Products by Spectrophotometric Methods”. Agrobiodiversity for Improving Nutrition, Health and Life Quality, no. 1, Nov. 2017, https://agrobiodiversity.uniag.sk/scientificpapers/article/view/52.