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Cukrowski, I., Zeevaart, J. R., & Jarvis, N. V. (1999). A potentiometric and differential pulse polarographic study of CdII with 1-hydroxyethylenediphosphonic acid. Analytica Chimica Acta, 379(1-2), 217–226. doi:10.1016/s0003-2670(98)00573-x 
10.1016/S0003-2670(98)00573-X