S.N.Obloberdiyev, et al. “DEVELOPMENT OF A NATURAL PH INDICATOR BASED ON ANTHOCYANIN-CONTAINING LOCAL RAW MATERIALS AND VISUAL ASSESSMENT OF FOOD PRODUCT FRESHNESS”. JOURNAL OF NEW CENTURY INNOVATIONS, vol. 101, no. 1, May 2026, pp. 252-5, https://journalss.org/index.php/new/article/view/30586.