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Ngô, T.T.X., Lê, Đức A. and Nguyễn, Q.M. 2025. Electrochemical analysis of sildenafil citrate based on electrode modified by reduced graphene oxide doped with nitrogen and sulfur. Hue University Journal of Science: Natural Science. 134, 1C (Jun. 2025). DOI:https://doi.org/10.26459/hueunijns.v134i1C.7820.