El-Koffy, M., A, A., El-khaleek, A., A, A. (2005). 'PREPARATION AND EVALUATION OF COMBINED INACTIVATED ALUMINIUM HYDROXIDE GEL VACCINE AGAINST DUCK VIRUS HEPATITIS AND DUCK PLAGUE DISEASES PRIVATE', Veterinary Medical Journal (Giza), 53(4), pp. 901-909. doi: 10.21608/vmjg.2005.385435