A. Mazurek and M. Włodarczyk-Stasiak, “A comparison of vitamin C content determination by chromatographic and spectrophotometric methods according to standard PN-A-04019:1998”, Curr. Issues Pharm. Med. Sci., vol. 26, no. 4, pp. 443–447, Dec. 2013, doi: 10.12923/j.2084-980X/26.4/a.21.