PT - JOURNAL ARTICLE AU - Letters TI - LETTERS TO THE EDITOR DP - 1989 Sep 01 TA - PDA Journal of Pharmaceutical Science and Technology PG - 199--198 VI - 43 IP - 5 4099 - http://journal.pda.org/content/43/5/199.short 4100 - http://journal.pda.org/content/43/5/199.full SO - PDA J Pharm Sci Technol1989 Sep 01; 43