GONGGO, S. T.; RADIMAN, C. L.; BUNDJALI, B.; ARCANA, I. M. Properties of Polymer Electrolyte Membranes Prepared by Blending Sulfonated Polystyrene with Lignosulfonate. Journal of Mathematical and Fundamental Sciences, v. 44, n. 3, p. 285-295, 7 Aug. 2014.