V. O. Gubanov, A. P. Naumenko, I. S. Dotsenko, M. M. Sabov, D. V. Gryn, and L. A. Bulavin, “Fine Spin-Dependent Splitting of Electronic Excitations and Their Dispersion in Single-Layer Graphene and Graphite”, Ukr. J. Phys., vol. 65, no. 7, p. 625, Jul. 2020.