Shafeeq, Noorhan Khalid. “Polymer Chain Reaction (PCR): Principle and Applications”. Ibn AL- Haitham Journal For Pure and Applied Sciences 34, no. 4 (October 20, 2021): 35–44. Accessed May 25, 2022. https://jih.uobaghdad.edu.iq/index.php/j/article/view/2699.