Kuryshchuk, S., T. Kovalyuk, I. Koziarskyi, and M. Solovan. “Structural, Electrical and Optical Properties of Graphite Films Are Drawn With Pencils of Different Hardness”. East European Journal of Physics, no. 3, Sept. 2022, pp. 91-96, doi:10.26565/2312-4334-2022-3-12.