da Silva, L. S., Oliveira, T. N., Ballin, M. A. and Peixoto, C. R. de M. (2006) “Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid”, Eclética Química, 31(4), pp. 39–42. doi: 10.26850/1678-4618eqj.v31.4.2006.p39-42.