1. 1) K. H. Moon, M. S. Park, S. Yoo, J. K. Park, J. W. Cho and G. Shin: Proc. 8th Pacific Rim Int. Cong. on Advanced Materials and Processing, ed. by F. Marquis, Springer, Cham, (2013), 735.
2. 2) S. C. Zhou: Metallurgist, 57 (2013), 510.
3. 3) B. Lu, K. Chen, W. Wang and B. Jiang: Metall. Mater. Trans. B, 45 (2014), 1496.
4. 4) J. Qi, C. Liu and M. Jiang: Can. Metall. Q., 56 (2017), 212.
5. 5) R. W. Luth: Am. Mineral., 73 (1988), 297.