Zherikova, K. V.; Morozova, N. B.; Kuratieva, N. V.; Baidina, I. A.; Igumenov, I. K. Synthesis and structural investigation of hafnium(IV) complexes with acetylacetone and trifluoroacetylacetone. Journal of Structural Chemistry. November 2005, 46 (6): 1039–1046. doi:10.1007/s10947-006-0239-2.