SAYED, I. S. MULTI-FREQUENCY ULTRASOUND IMAGING: PHANTOM STUDY. International Journal of Allied Health Sciences, [S. l.], v. 2, n. 2, p. 304–309, 2018. DOI: 10.31436/ijahs.v2i2.164. Disponível em: https://journals.iium.edu.my/ijahs/index.php/IJAHS/article/view/164. Acesso em: 28 aug. 2025.