1. Martell, A.E., Sillèn, L.G.: Stability Constants of Metal Ion Complexes. Special Publications Nos. 17 and 25. The Chemical Society, London (1964/1971)
2. Perrin, D.D.: Stability Constants of Metal Ion Complexes, Part B: Organic Ligands. IUPAC Chemical Data, Series No. 22. Pergamon Press, Oxford (1979)
3. Pettit, L.D., Powell, H.K.: IUPAC, Stability Constants: Data Base. Academic Software, Timble Otley Yoks (1993)
4. Königsberger, E., Wang, Z., Königsberger, L.C.: Solubility of l-cystine in NaCl and artificial urine solutions. Mh. Chem. 131, 39–45 (2000)
5. Carta, R., Tola, G.: Solubilities of l-cystine, l-tyrosine, l-leucine, and glycine in aqueous solutions at various pHs and NaCl concentrations. J. Chem. Eng. Data 41, 414–417 (1996)