D. Zheng, K. Wei, W. Ma, Z. Sheng, and Y. Dai, “A mathematical model for distribution of calcium in silicon by vacuum directional solidification”, J Min & Metal B Metallurgy, vol. 52, no. 2, pp. 157–162, Oct. 2016, Accessed: Jul. 12, 2026. [Online]. Available: https://asistent.ceon.rs/index.php/jmm/article/view/7248