DE SOUZA, Mário Everaldo. Quark Mass, Quark Compositeness, and Solution to the Proton Spin Puzzle. Scientia Plena, [S. l.], v. 4, n. 3, 2011. Disponível em: https://scientiaplena.org.br/sp/article/view/609. Acesso em: 15 abr. 2025.