SIRKELI, V.P.; HARTNAGEL, H.L. ZnO-based terahertz quantum cascade lasers. Opto-Electronics Review, [S. l.], v. 27, n. 2, p. 119–122, 2019. DOI: 10.1016/j.opelre.2019.04.002. Disponível em: https://wydawnictwo.pan.pl/index.php/opelre/article/view/645. Acesso em: 21 aug. 2026.