1. Influenza vaccination in 29 Coun-tries, an update to 1997;Ambrosch;Pharmaco Economivs,1999
2. Biuletyny statystyczne MZ i OS od 1957r (in Polish).
3. Influenza in Poland: epidemiology and prevention. European Working Group on Influenza;Brydak;Influenza Bull,1998
4. Influenza and its prophylaxis;Brydak,1998
5. Seroconversion assessment in a billeted military medical university student group after antiinfluenza subunit vaccination in 1993/94 in Poland;Brydak;Antiinfect Drugs Chemother,1997