Kirakosyan, Virab G., et al. “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”. Proceedings of the YSU B: Chemical and Biological Sciences, vol. 55, no. 3 (256), Dec. 2021, pp. 296-9, doi:10.46991/PYSU:B/2021.55.3.296.