Liang Tong, Ming-, Zhong- Yuan Zhou, Yu-’ Luan Wu, and Xiao- Ming Chen. 1996. “Synthesis, Crystal Structures and Magnetic Properties of tetrakis(12-Carboxylate)-Bridged Dimeric gadolinium(III) Complexes”. Malaysian Journal of Science 17 (2):87-100. http://jice.um.edu.my/index.php/MJS/article/view/9421.