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\bibitem{Ehirim_etal2022} {\textquotedblleft}\textit{Onion-like carbons provide a favorable electrocatalytic platform for the sensitive detection of tramadol drug}{\textquotedblright}. Ehirim TJ, Ozoemena OC, Mwonga PV, Haruna AB, Mofokeng TP, De Wael K, Ozoemena KI, ACS Omega \textbf{7}, 47892 (2022).   http://doi.org/10.1021/ACSOMEGA.2C05722

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