ZHANABAYEV, Z. Z.; GREVTSEVA, T. Y.; ASANOV, G. S. Hierarchy of excitonic formations. International Journal of Mathematics and Physics, [S. l.], v. 3, n. 1, p. 36–39, 2012. Disponível em: https://ijmph.kaznu.kz/index.php/kaznu/article/view/64. Acesso em: 28 apr. 2024.