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Brillas, E., Farnia, G., Severin, M. G., & Vianello, E. (1986). Self-protonation effects in the electrochemical reduction mechanism of p-nitrobenzoic acid. Electrochimica Acta, 31(7), 759–766. doi:10.1016/0013-4686(86)85004-6 
10.1016/0013-4686(86)85004-6