Y. P. Pershyn, I. G. Shipkova, O. Y. Devizenko, V. V. Mamon, V. S. Chumak, and V. V. Kondratenko, “Structure and Phase Composition of W-Si Multilayer X-Ray Mirrors”, East Eur. J. Phys., vol. 5, no. 3, pp. 32-44, Sep. 2018.