Zhen Yao. “Helical Iodine Chains Inside Single-Walled Boron Nitride Nanotubes: Finding the Optimal Helical Radius and Helical Angles”. Global Journal of Science Frontier Research, vol. 16, no. A4, Mar. 2016, pp. 13-22, https://journalofscience.org/index.php/GJSFR/article/view/1874.