Amitava Ray; S. K. Dhua; R. R. Prasad; S. Jha; S. Banerjee (1997). "The ancient 11th century iron pillar at Dhar, India: a microstructural insight into material characteristics". Journal of Materials Science Letters. 16 (5): 371–375. doi:10.1023/A:1018550529070. S2CID134653889.
Amitava Ray; S. K. Dhua; R. R. Prasad; S. Jha; S. Banerjee (1997). "The ancient 11th century iron pillar at Dhar, India: a microstructural insight into material characteristics". Journal of Materials Science Letters. 16 (5): 371–375. doi:10.1023/A:1018550529070. S2CID134653889.