L. Singh, A. Sharma, and S. Sindhu, “Structure and Bonding of Some Newly Syntheisised Complexes of Lanthanide(III) Complexes of 4[N-(p-dimethylaminobenzalidene) Amino] Antipyrine Thiosemicarbazone”, ajc, vol. 11, no. 4, pp. 1445–1450, Mar. 2010.