IOFFE, Alexander. On necessary conditions in the generalized Bolza problem. Serdica Mathematical Journal, Sofia, Bulgaria, v. 49, n. 1–3, p. 9–32, 2023. DOI: 10.55630/serdica.2023.49.9-32. Disponível em: https://serdica.math.bas.bg/index.php/serdica/article/view/33. Acesso em: 2 nov. 2026.