Kavalcová, P. ., Bystrická, J. ., Tomáš, J. ., Karovičová, J. ., Kovarovič, J. . and Lenková, M. . (2015) “The content of total polyphenols and antioxidant activity in red beetroot”, Potravinarstvo Slovak Journal of Food Sciences, 9(1), pp. 77–83. doi: 10.5219/441.