1. Beare, A.S., Maassab, H.F., Tyrrell, D.A.J., Slepuskin, A.N., Hall, T.S.: A comparative study of attenuated influenza viruses. Bull. WHO44, 593–598 (1971)
2. Beare, A.S., Schild, G.C., Craig, J.W.: Trials in man with live recombinants made from A/PR/8/34 (H0N1) and wild H3N2 influenza viruses. Lancet1975 II, 729–732
3. Symposium Series in Immunobiological Standards;E.A. Edwards,1972
4. Gabridge, M.G., Polisky, R.B.: Quantitative reduction of 2,3,4-triphenyl tetrazolium chloride by hamster tracheal organ cultures: effects ofMycoplasma pneumonia cells and membranes. Infect. and Immun.13, No. 1, 84–91 (1976)
5. Hugelyn, C.: Laboratory and clinical evaluation of new live influnza virus vaccines. Need for minimum requirements. IABS Symposium on Influenza Immunisation Association of Biological Standardization. (in press) (1977)