JONES, H. F. Perturbation Theory for PT-Symmetric Sinusoidal Optical Lattices at the Symmetry-Breaking Threshold. Acta Polytechnica, [S. l.], v. 51, n. 4, 2011. DOI: 10.14311/1396. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1396. Acesso em: 28 apr. 2024.