5 Levin E M, Robbins CBR, McMurdie H F. In: Reser M K ed., Phase Diagrams for Ceramists, Supplement, The American Ceramic Society, 1969: Fig. 237. Fig. 2299. Fig. 2372
9 Gschneidner K A Jr., Kippenhan N, NcMasters O D. Thermochemistry of the Rare Earths, Amesl Iowa: Rare Earth Infoimation Center, Institute for Atomic Research, 1973: 25
[10]
10 Fincham C J B, Richarason F D. Proc Roy Soc, London, 1954: A223: 40
[11]
11 Yokokawa t, Niwa K. Trans Jpn Inst Met, 1969; 10: 3
[12]
12 Yokokawa T, Niwa K. Trans Jpn Inst Met, 1969; 10: 81
[13]
13 Lin P L Pelton A D. Metall Tians, 1979; 10B: 667