AL-HARBI, Yazzed. The Proton Problem & Proton Spin Crisis : The Color Confinement Mathematical Mechanism for the Existence of the Hadrons. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 34, n. 1, p. 114–122, 2017. Disponível em: https://asrjetsjournal.org/American_Scientific_Journal/article/view/3172. Acesso em: 26 oct. 2025.