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2. Transmission of antiviral activity via the egg and the role of congenital passive immunity to ND in chickens;Brandly;Am. J. Vet. Res.,1946
3. Newcastle disease - a world poultry problem;Chu;Wld. Anim. Rev.,1972
4. Vergleichende Untersuchungen über den Nachweis hämagglutinationshemmender und virusneutralisierender Antikörper nach Vaccination gegen die Newcastle disease. XIV.;Kaleta;World's Poultry Congress Madrid,1970