1. FDA/CDER. Draft guidance for industry: bioavailability and bioequivalence studies for nasal aerosols and nasal sprays for local action. Food and Drug Administration Web site. 1999; Available at: http://www.fda.gov/cder/guidance/2070DFT.pdf. Accessed March 28, 2007.
2. Tsong Y. Statistical comparison of particle size distribution profiles. 2004; Available at: http://pqri.org/commworking/minutes/pdfs/dptc/psdpcwg/Addl/DC01-475116-v2-Yi_Tsong_Statistical_Archive_PQRI_Profile_Comparisons.DOC. Accessed June 22, 2007.
3. Tsong Y. Profile analysis of cascade impactor data: proposed FDA approach. Presentation to OINDP Subcommittee of the Advisory Committee for Pharmaceutical Science. Rockville, MD: US Pharmacopeia; April 26, 2000. Available at: http://www.fda.gov/ohrms/dockets/ac/00/slides/3609s1e.ppt. Accessed October 19, 2006.
4. United States Pharmacopeial Convention. Chapter 601. Aerosols, metered-dose inhalers, and dry powder inhalers. In:USP30-NF25. Rockville, MD: USP; 2007:220–240.
5. DeLuca PP, Lyapustina S. Product Quality Research Institute reports.AAPS PharmSciTech [serial online]. 2007;8:article 6.