1. Purification of influenza virus in the K-II zonal centrifuge.;Gerin;Nature,1969
2. World Health Organization. Recommendations for influenza vaccine composition. [cited 2005 Nov 10]. Available from http://www.who.int/csr/disease/influenza/vaccinerecommendations1/en/
3. Centers for Disease Control and Prevention. Update: Influenza Activity United States, 2004–05 Season. [cited 2005 Nov 10]. Available from http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5408a1.htm
4. Future influenza vaccines and the use of genetic recombinants.;Kilbourne;Bull World Health Organ,1969
5. Cold-adapted influenza viruses for use as live vaccines for man.;Maassab;Adv Biotechnol Processes,1990