Concentrations of HCG Hormone in Urine by Optical means . Journal of the College of Basic Education, [S. l.], v. 14, n. 53 ، 54 ،55, p. 21–26, 2023. DOI: 10.35950/cbej.v14i53 ، 54 ،55.9477. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/9477.. Acesso em: 21 apr. 2025.