Yakovlev, V. B. (August 1957). "Development of Wrought Iron Production". Metallurgist. Volume. 1 (8). New York: Springer: 546. doi:10.1007/BF00732452. S2CID137551466. 0026-0894.
Yakovlev, V. B. (August 1957). "Development of Wrought Iron Production". Metallurgist. Volume. 1 (8). New York: Springer: 546. doi:10.1007/BF00732452. S2CID137551466. 0026-0894.