The Mode Expansion of the String Fields . Bulletin of Pure and Applied Sciences – Physics, [S. l.], v. 42, n. 1, p. 46–63, 2023. DOI: 10.48165/bpas.2023.42D.1.4 . Disponível em: https://acspublisher.com/journals/index.php/bpasphy/article/view/8261.. Acesso em: 22 jul. 2024.