REICH, E. On the variational principle of Gerstenhaber and Rauch. Annales Fennici Mathematici, [S. l.], v. 10, n. 1, p. 469–475, 1985. DOI: 10.5186/aasfm.1985.1052. Disponível em: https://afm.journal.fi/article/view/134547. Acesso em: 25 nov. 2024.