“Concentrations of HCG Hormone in Urine by Optical Means ”. Journal of the College of Basic Education 14, no. 53 ، 54 ،55 (January 19, 2023): 21–26. Accessed July 1, 2024. https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/9477.