DUC, D. V.; HANG, P. T. T. Quantization Structure of Orbital Oscillators and Mass Spectrum of Bosonic String. Communications in Physics, [S. l.], v. 17, n. 4, p. 193–197, 2008. DOI: 10.15625/0868-3166/17/4/10694. Disponível em: https://vjs.ac.vn/index.php/cip/article/view/10694. Acesso em: 24 apr. 2024.