Riri, M. et al. 2017. Di- and tetranuclear gadolinium (III) complexes of 2-hydroxypropane-1,2,3-tricarboxylic acid and 1,2,2-trimethylcyclopentane-1,3-dicarboxylic acid : identification and characterization. International Journal of Advanced Chemistry. 5, 2 (Nov. 2017), 102–107. DOI:https://doi.org/10.14419/ijac.v5i2.8471.