Seal, B.K., and D.K. Chatterajee. “Ion-Solvent Interaction in Aqueous Solutions of Alkali Metal Salts of 2,6-Dihydroxy-,2,4-Dihydroxy-and 2-Hydroxy-4-Aminobenzoic Acids ”. Asian Journal of Chemistry, vol. 6, no. 4, Mar. 2010, pp. 840-8, https://asianpubs.org/index.php/ajchem/article/view/24683.