STUPKA, A. A. Long-Wave High-Frequency Oscillations in Ionic Crystals with Two Atoms in Elementary Cell. Ukrainian Journal of Physics, [S. l.], v. 58, n. 9, p. 863, 2018. DOI: 10.15407/ujpe58.09.0863. Disponível em: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018362. Acesso em: 25 apr. 2024.