ELZEBAIR, Amna Mohammed Osman. Maximum and Minimum Energy in Vortex Motion. Journal of natural sciences, life and applied sciences, New Mexico, United States, v. 1, n. 2, p. 20–30, 2017. DOI: 10.26389/AJSRP.A271216. Disponível em: https://www.ajsrp.ojsexpert.com/index.php/jnslas/article/view/957. Acesso em: 20 dec. 2025.