1. Dry powder aerosols I;Bell;J. Pharm. Sci.,1971
2. An improved design of powder inhaler;Hallworth;Br. J. Clin. Pharmacol.,1977
3. Dose reliability of the Serevent Diskhaler system;Sumby;Pharm. Technol. Int.,1993
4. Turbohaler;Wetterlin;Pharm. Res.,1988
5. Design, manufacture and dose consistency of the Serevent Diskus inhaler;Brindley;Pharmnol. Tech. Eur.,1995