SASTRY, H. Singing Propellers. Defence Science Journal, [S. l.], v. 32, n. 1, p. 67–73, 2014. DOI: 10.14429/dsj.32.7707. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/7707. Acesso em: 18 aug. 2025.