YAZZED AL-HARBI. The Proton problem & Spin Crisis: The mathematical mechanism for the existence of the hadrons. International Journal of Emerging Trends in Science and Technology, [S. l.], v. 4, n. 07, p. 5310–5316, 2017. Disponível em: http://ijetst.in/index.php/ijetst/article/view/1180. Acesso em: 20 may. 2024.