@article {147195,
	title = {Pathogenicty of  infectious bursal virus field isolates to seronegative commercial male layer chickens. },
	journal = {Proc. Sci. 4th Inter., Conf., Vet. Div. NRC, Dokki, 26- 28 february,},
	year = {2008},
	pages = {71-83.},
	author = {M.M. Amer and M.A. kutkat and K. M.EL-Bayomi and M. ABD E- S. Shakal and Sherein S. Abd EL-Gaied}
}
