1: Greenwood,N.N., Earnshaw,A. Chemistry of the elements
2nd edition (1997) Edited by Greenwood,N.N., Earnshaw,A. pp. 1-1340, Butterworth-Heinemann. Oxford. Great Britain

2: Buch,A. Pure Metals Properties. A Scientific-Technical Handbook
1st edition (1999) Edited by Buch,A. pp. 1-306, ASM International and Freund Publishing House Ltd. Ohio. USA

3: CRC Handbook of Chemistry and Physics
75th edition (1994) Edited by Lide,D.R. , CRC Press Inc. Boca Raton, USA

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

5: Haley,T.J., Raymond,K., Komesu,N., Upham,H.C. Toxicological and pharmacological effects of gadolinium and samarium chlorides
Br. J. Pharmacol. Chemother. (1961) 17 pp 526-532

6: Egler,S.G., Roldão,T.M., Santos,G.O., Heidelmann,G.P., Giese,E.C., Correia,F.V., Saggioro,E.M. Acute toxicity of single and combined rare earth element exposures towards Daphnia similis
Ecotoxicol. Environ. Saf. (2023) 251 114538

7: Live Chart of Nucleotides
Nuclear Data Service.