“DEVELOPMENT OF A RAPID AND EFFICIENT METHOD FOR QUANTITATIVE DETERMINATION OF N-NITROSODIMETHYLAMINE IMPURITY BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY IN METFORMIN HYDROCHLORIDE, LOSARTAN POTASSIUM, VALSARTAN AND RANITIDINE MEDICINAL RAW MATERIALS AND ITS PRODUCTS” (2021) Proceedings of the YSU B: Chemical and Biological Sciences, 55(3 (256), pp. 296–299. doi:10.46991/PYSU:B/2021.55.3.296.