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Fernandes, L. C., Matos, J. R., Zinner, L. B., Vicentini, G., & Zukerman-Schpector, J. (2000). Crystal structures, spectroscopic, TG and DSC studies of lanthanide picrate complexes with 4-methylmorpholine N-oxide (MMNO). Polyhedron, 19(22-23), 2313–2318. doi:10.1016/s0277-5387(00)00494-0 
10.1016/S0277-5387(00)00494-0