A. M. Elhassan, A. M. Babiker, M. E. Ahmed, and A. M. El Hussein, “Coinfections of Sudanese dairy cattle with bovine herpes virus 1, bovine viral diarrhea virus, bluetongue virus and bovine herpes virus 4 and their relation to reproductive disorders”, J. Adv. Vet. Anim. Res, vol. 3, no. 4, pp. 332–337, Feb. 2017.