Ibtisam E.M. El Zubeir, M.E.M. El Hassen and O. Yagoub Sanaa
International Journal of Dairy Science 1 ( 2 ): 155 - 160 , 2006
E.M. El Zubeir Ibtisam, B.O. El Zubeir Sanna and O. Yagoub Sanaa
Research Journal of Microbiology 1 ( 1 ): 76 - 82 , 2006