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5: Standard Methods for the Analysis of Water and Wastewater", APHA, 1992, 18th edition

6: The Merck Index
12th edition (1996) Edited by Budavari,S., Merck Research Laboratories, USA

7: Fowler, B.A., Yamauchi, H., Conner, E.A., Akkerman, M. Cancer risks for humans from exposure to the semiconductor metals
Scand J Work Environ Health (1993) 19 (1) pp 101-103

8: Kemnic,T.R., Coleman,M. Thallium Toxicity
StatPearls (2022) Treasure Island (FL): StatPearls Publishing

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Postgrad. Med. J. (2003) 79 pp 103–105

10: Live Chart of Nucleotides
Nuclear Data Service.