“The Effect of Two Challenge Doses of Dictyocaulus Filaria on the Acquired Immunity of Sheep Vaccinated With ‘Filiraq’”. The Iraqi Journal of Veterinary Medicine 23, no. 1 (June 28, 1999): 1–10. Accessed May 3, 2024. https://jcovm.uobaghdad.edu.iq/index.php/Iraqijvm/article/view/1183.