LINO, J.L.S.; DE FARIAS, A.R.; ARAÚJO, N.S. Aspects of the Schwinger Variational Principle Formulation. Trends in Computational and Applied Mathematics, [S. l.], v. 1, n. 1, p. 175–178, 2000. DOI: 10.5540/tema.2000.01.01.0175. Disponível em: https://tcam.sbmac.org.br/tema/article/view/505. Acesso em: 18 dec. 2024.