JAČIAUSKAS, I. The differential duels. Lithuanian Mathematical Journal, [S. l.], v. 8, n. 1, p. 185–191, 1968. DOI: 10.15388/LMJ.1968.20195. Disponível em: https://www.journals.vu.lt/LMJ/article/view/20195.. Acesso em: 5 may. 2024.