1. Cytoplasmic particles of chorio-allantoic membrane and their relations to purified preparations of influenza virus;Cohen,1944
2. Quantitative absolute methods in the study of antigenantibody reactions;Heidelberger;Bacteriol. Revs.,1938
3. In vivo titration of influenza virus and of neutralizing antibodies in chick embryos;Hirst;J. Immunol.,1942
4. A method for the titration of influenza hemagglutinins and influenza antibodies with the aid of a photoelectric densitometer;Hirst;J. Immunol.,1942
5. Titration of influenza virus in chick embryos;Knight;J. Exptl Med.,1944