[1] Westbrook, J. H.: Metal Progr., 1962, (2) , 97. [2] Old, L. E., Rengstorff, G. W. P.: Trans. AIME, 1957, 209, 468. [3] Gschneidner, K. A.: Rare Earth Alloys, (D. Van Nostrand Co., 1961) , p. 220. [4] Chuang Yu-chin (庄育智), Chuang Tsiang-lin (庄祥麟), Wu Cheung-hang (吴昌衡): Sci. Sinica. 1964, 13, 1851. [5] Jaffee, R. I., Nielsen, H. P.: Trans. AIME, 1949, 180, 603. [6] Spedding, F. H., Hanak, J. J., Daane, A. H.: J. Less-Common Metals, 1961, 3, 110. [7] Spedding, F. H., Danne, A. H., Herrmann, K. W.: Acta Cryst., 1956, 9, 559. |