S. L. Revo, M. M. Melnichenko, T. G. Avramenko, K. O. Ivanenko, and V. O. Andruschenko, “Microhardness of ?ompacted thermally expanded graphite”, BTSNUKPhM, no. 1, pp. 174–177, Feb. 2019, doi: 10.17721/1812-5409.2019/1.40.