1. Thissen P., Binnemans K. - Chapter 248 - Accomodation of the rare earth in the periodic table: A historical analysis. // Handbook of the Physics and Chemistry of Rare Earths. 2011. V. 41. P. 1 - 93.
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http://dx.doi.org/10.1016/B978-0-444-53590-0.00001-7
