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the Physics and Chemistry of Rare Earths. Vol. 50. pp. 12–16. ISBN 978-0-444-63851-9. Jensen, William B. (1982). "The Positions of Lanthanum (Actinium)...

the Physics and Chemistry of Rare Earths. Vol. 50. pp. 12–16. ISBN 978-0-444-63851-9.{{cite book}}: CS1 maint: multiple names: authors list (link) Krishnamurthy...