Rare earth metals.

Electronic structure of rare - earth metals and alloys Anouk, A. 1977 Fluctuational superconductivity of magnetic systems Savchenko, M. A. 1990 Lanthanides and actinides Cotton, Simon 1991 Nuclear magnetic resonance shift reagents Edited by Robert E. Sievers 1973 Rare earth elements in ultramafic and mafic rocks and their minerals Lesnov, F. P. 2012 Rare earth elements in ultramafic and mafic rocks and their minerals Lesnov, F. P. 2010 Rare metal extraction Jamrack, W. D. 1963 The chemistry of the lanthanides Moeller, Therald 1963 The chemistry of the rare-earth elements Topp, N. E. 1965 The rare-earth elements and their compounds Yost, Don M. 1947