SIRPAL, J. P. On heydenreich method of internal ballistics. Defence Science Journal, [S. l.], v. 8, n. 4, p. 347–351, 2014. DOI: 10.14429/dsj.8.7609. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/7609. Acesso em: 3 aug. 2025.