K. A. Gasanov, J. I. Guseinov, I. I. Abbasov, F. I. Mamedov, and D. J. Askerov, “Dielectric Function of a Quantum-Confined Thin Film with a Modified Pöschel–Teller Potential”, Ukr. J. Phys., vol. 63, no. 12, p. 1109, Dec. 2018.