The inverse problem of variational calculus and the problem of mixed endpoint conditions. São Paulo Journal of Mathematical Sciences, [S. l.], v. 2, n. 2, p. 239–261, 2008. DOI: 10.11606/issn.2316-9028.v2i2p239-261. Disponível em: https://www.revistas.usp.br/spjournal/article/view/30.. Acesso em: 2 maio. 2024.