1. Alexsandrova, G. I.,et al.: Testing the safety and effectiveness of oral administration of a live influenza vaccine. Bull. Wld Hlth Org.42, 429?436 (1970).
2. Boudreault, A., G. Lussier etV. Pavilanis: Caractères biologiques de souches du virus de l'influenza adaptées à 29°C et à 41°C Canad. J. Microbiol.14, 867?874 (1968).
3. Boudreault, A., G. Boulay, andV. Pavilanis: Immunization against influenza by oral route. Canad. J. publ. Hlth62, 70 (1970).
4. Expert Committee on Respiratory Virus Diseases, First Report WHO Tech. Report Series No. 170, pp. 1?59 (1959).
5. Ikic, D.: Experience in Yugoslavia with live influenza vaccine prepared from an attenuated A2/Hong Kong/68 Strain. Bull. Wld Hlth Org.41, 608?609 (1969).