DAMBRAUSKAS, A.; RINKEVIČIUS, V. Algorithmic Methods of Variational Calculus. Elektronika ir Elektrotechnika, [S. l.], v. 85, n. 5, p. 25–28, 2008. DOI: 10.5755/j02.eie.11154. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/11154.. Acesso em: 24 may. 2026.