“Prevalence and Infection Rate of Three Gizzard Nematodes in the Mallard Anas Platyrhynchos L., 1758 Collected in Al-Diwaniya and Diyala Provinces , Central Iraq”. 2016. Ibn AL-Haitham Journal For Pure and Applied Sciences 24 (3). https://jih.uobaghdad.edu.iq/index.php/j/article/view/815.