Salih Sahib Al-Difaie, R. “Identification of Cryptosporidium Parvum Parasite Oocyst Using Microscopic &PCR Assay for Detection GP900gene”. Al-Qadisiyah Journal of Pure Science, Vol. 20, no. 3, July 2018, pp. 28 -40, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/834.