Chaturvedi, P., P. Verma, A. Singh, P. K. Chaudhary, D. Harsh, and P. K. Basu. “Carbon Nanotube–Purification and Sorting Protocols”. Defence Science Journal, vol. 58, no. 5, Sept. 2008, pp. 591-9, doi:10.14429/dsj.58.1694.