Al.Samarrae SA, Hassan SA, Latif ,B. M. The effect of two challenge doses of Dictyocaulus filaria on the acquired immunity of sheep vaccinated with "Filiraq". Iraqi J. Vet. Med. [Internet]. 1999 Jun. 28 [cited 2025 Dec. 2];23(1):1-10. Available from: https://jcovm.uobaghdad.edu.iq/index.php/Iraqijvm/article/view/1183