Eshtiagh-Hosseini, H. et al. 2010. A new three dimensional proton transfer compound including citric acid and 2,4,6-triamine-1,3,5-triazine: synthesis, characterization and X-ray crystal structure. European Journal of Chemistry. 1, 3 (Sep. 2010), 179–181. DOI:https://doi.org/10.5155/eurjchem.1.3.179-181.44.