Stojanovska, Tanja, et al. “SPECTROPHOTOMETRIC DETERMINATION OF BETALAINS AND TOTAL PHENOLS IN ALBUMIN CHEESE ENRICHED WITH ORGANIC BEETROOT POWDER”. KNOWLEDGE - International Journal , vol. 69, no. 3, Apr. 2025, pp. 607-12, https://ojs.ikm.mk/index.php/kij/article/view/7278.