SHARMA, AJAY, et al. “Anisotropy of L Sub-Shell X-Rays in Tungsten at Photon Energies, below and above the L2-Edge”. Asian Journal of Chemistry, vol. 18, no. 5, Mar. 2010, pp. 3335-9, https://asianpubs.org/index.php/ajchem/article/view/13854.