1. Kyazym-zade, A.G., Agaeva, A.A., Salmanov V.M., and Mokhtari, A.G., Excitonic Absorption in GaSe and InSe Crystals under Picosecond Excitation, Neorg. Mater., 2007, vol. 43, no. 12, pp. 1419–1423.
2. Savchuk, A.I., Govaleshko, N.L., Dalevskii, G.D., and Kovalyuk, Z.D., Hyperbolic Excitons in InSe, Ukr. Fiz. Zh. (Russ. Ed.), 1972, vol. 17, pp. 1548–1552.
3. Abutalybov, G.I. and Belle, M.L., Modulation Spectrum and Absorption Line Shape of Hyperbolic Excitons in Indium Selenide, Fiz. Tekh. Poluprovodn. (Leningrad), 1974, vol. 8, no. 8, pp. 2392–2397.
4. Dvornikov, D.P., Salmanov, V.M., and Yaroshetskii, I.D., Observation of a Resonance Emission in the Continuum Region of Semiconductors, Pis’ma Zh. Eksp. Teor. Fiz., 1974, vol. 20, no. 1, pp. 17–20.
5. Virko, S.V., Lisitsa, M.P., and Motsnyi, F.V., Evidence of Hyperbolic Excitons in the Layered Semiconductor Bil3, Fiz. Tverd. Tela (S.-Peterburg), 2000, vol. 42, no. 9, pp. 1579–1581.