D. C. Finnen and A. A. Pinkerton
The Chelating Agent N,N,N',N'',N''',N'''-Triethylenetetraminehexacetic Acid (TTHA)
Acta Crystallographica Section C, Volume 53, Part 10 (October 1997), 1455-1457
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http://dx.doi.org/10.1107/S0108270197005969