PERDEW, J. P. . Symmetry breaking with a proper approximate density functional: Exact ground-state energy as a close lower bound on the computed energy. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 52, n. 9, p. 1216–1221, 2026. Disponível em: https://fnt.ilt.kharkiv.ua/index.php/fnt/article/view/9800. Acesso em: 28 лип. 2026.